Add some notes to start with.

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+* Gameplay details
+  - 10 absorbed bullets = 1 homing missile
+  - homing missiles are 10x more powerful than regular shot
+  - how missiles work:
+    - find the closest enemy
+    - allocate as many missiles as needed to kill it, or all the missiles
+      if there aren't enough to kill it
+    - if there are still missiles left over, repeat with the next
+      closest enemy
+  - when changing polarity, there's about 7-8 frames where your shield
+    isn't working and any type of bullet can kill you
+  - chain score bonuses:
+    - 1 Chain --- 100 points
+    - 2 Chain --- 200 points
+    - 3 Chain --- 400 points
+    - 4 Chain --- 800 points
+    - 5 Chain --- 1,600 points
+    - 6 Chain --- 3,200 points
+    - 7 Chain --- 6,400 points
+    - 8 Chain --- 12,800 points
+    - Max Chain - 25,600 points
+  - you get points for absorbing bullets but I'm not sure how many
+
+* Ikaruga Stage 1
+** Enemy Types
+   - Utatsugumi (big popcorn orbs)
+     - health: 1
+     - points: 20
+     - bullets on death: 5
+   - Toratsugumi (little popcorns)
+     - health: 1
+     - points: ?
+     - bullets on death: 5
+   - Renjyaku (fast bird-like shooters)
+     - health: ?
+     - points: ?
+     - bullets on death: 7
+   - Torafuzuku (big laser shooters)
+     - health: ?
+     - points: ?
+     - bullets on death: 32?
+   - Ajisashi (train-like thing)
+     - points: ?
+     - bullets on turret death: 5
+     - bullets on death: 32?
+   - Eboshidori (boss)
+   - Eboshidori's satellites
+
+** Phases
+**** intro
+ikaruga enters the screen, player controls activate
+**** utatsugumi sweeps
+6 white from the top-right
+6 black from the top-left
+6 white
+6 black
+**** toratsugumi wall
+a 3 wide by 6 tall block of white toratsugumi enter from the right and
+take up position on the left.  at the same time a 3 wide by 6 tall
+block of black toratsugumi enter from the left and take up position on
+the right.  each block rests a moment then drifts off screen on the
+same side they entered.
+**** small toratsugumi sweep
+3 white from the right followed by 3 black from the left.
+**** interstitial
+chapter 1 text appears, ship flies to next section
+**** renjyaku attack
+3 white renjyaku in triangle formation enter from the top-left corner
+and take position on the center-left, about halfway down the
+screen. they take a moment to setup, aim at the player, and fire a
+direct stream of bullets at them.  3 more white renjyaku do the same,
+but from the top-right and take position in center-right. repeat for
+black, black, white, black. alternate the side each time. 3 white
+renjyaku take position in the top-left, less than one second later 3
+black renjyaku take position in the top right.
+
+brief pause, then two triangle formations (so 6 ships total) enter the
+top of the screen. from left to right, the color sequence is: black,
+black, white, black, white, white.
+
+alternating from top-right/top-left corner, 3 white renjyaku sweep the
+screen while shooting straight down. then renjyaku enter in the same
+alternating fashion, but instead of sweeping they swap sides
+occasionally as they move down the screen. every time they reach a new
+side, they shoot straight down.  the color sequence is: white, black,
+white, black, white, black.  as soon as all 6 ships have appeared on
+screen, 6 black renjyaku enter: 3 on the far-left, 3 on the far-right,
+with vertical gaps between forming 2 lines. they fly straight down the
+screen and do not fire.
+
+finally, one white triangle formation quickly appears on the left,
+shooting straight down. less than a second later, a black formation
+does the same on the right.  if not killed quickly, they leave the
+screen on their respective sides.
+**** small toratsugumi sweep
+same as the other
+**** utatsugumi wall
+the utatsugumi spawn in-place at the top of the screen with a
+formation like this:
+
+  BWBW
+BWBWBWBW
+BWBWBWBW
+  BWBW
+
+They rotate around each other and I don't how to really describe it so
+just watch gameplay footage.
+**** small toratsugumi sweep
+same as before, but the next phase starts as this happening
+**** torafuzuku attack
+black torafuzuku on the left, white on the right.  2 utatsugumi of the
+respective color circling each.  each begins by firing arcs of bullets
+in clusters of 3 with big gaps between each cluster.  if not killed
+quickly enough, they start firing things I can only describe as
+"whips".  when the first one is killed, another replaces it
+immediately, for a total of 4 torafuzuku.
+**** big toratsugumi sweep
+left sweep formation:  WWB WBB BWW WWB
+right sweep formation: WBB WWB BBW WBB
+**** small renjyaku attack
+3 black renjyaku aligned horizontally followed by an offset group of 2
+white renjyaku.  all firing a barrage immediately.
+**** small torafuzuku attack
+a single white torafuzuku appears in the top center and immediately
+charges and shoots a laser that sweeps from left to right.
+**** utatsugumi ring
+ring of 12 utatsugumi appear in this formation: BBBWWWBBBWWW. the ring
+spins and adjusts diameter in a way I don't yet understand.
+**** toratsugumi line
+as the utatsugumi ring finshes it's sequence, 2 vertical lines of
+toratsugumis move down the screen. left line order: BWBWBWBW. right
+line order: WBWBWB.
+**** ajisashi attack
+just as the toratsugumi line appears, 2 ajisashis appear at the top of
+the screen. black on the left, white on the right. the black one moves
+vertically to the bottom of the screen and both activate their
+turrets. then the black one moves horizontally to the right side, and
+the white one moves horizontally to the left side. then the white one
+moves to the bottom and then black one moves to the top. they continue
+this pattern until they are killed or time out. new ajisashi's spawn
+if the first is killed quickly enough.
+**** toratsugumi lines
+about 7-8 seconds after the ajisashis spawn, another 2 vertical lines
+of toratsugumi scroll down the screen. each line has the same color in
+this pattern: BWBWBWBWBWBWBW
+**** toratsugumi wall
+this only appears if you defeat the ajisashis and toratsugumi lines
+fast enough. 5 horizontal lines of toratsugumi appear. as they scroll
+down the screen, the toratsugumi move either to the left or to the
+right, alternating with each line. the first line moves right, the
+next left, etc.  seems to be in this formation (the | marks the screen
+edge).
+
+   WWWBBB|WWWBBB|WWWBBB ->
+<- BBBWWW|BBBWWW|BBBWWW
+   WWWBBB|WWWBBB|WWWBBB ->
+<- BBBWWW|BBBWWW|BBBWWW
+   WWWBBB|WWWBBB|WWWBBB ->
+**** boss intro
+warning message. boss enters stage. assumes position at top of
+screen. 100 second timer appears.
+**** boss phase 1
+white bullets from sword.  black bullets from black satellites.
+**** boss phase 2
+black bullets from shield thing.  white bullets from white satellites.
+**** boss phase 3
+alternating white and black bombs.  white and black bullets from white
+and black satellites.
+**** boss phase 4
+white semi-homing missiles from arm (sword was destroyed in phase 1.)
+white and black bullets from white and black satellites.
+**** end
+boss is either killed or flees after 100 second timeout. battle report
+is displayed.
+
+
+* Sprites
+
+List of sprites needed:
+- Ikaruga
+- Ikaruga shield circle
+- Utatsugumi
+- Toratsugumi
+- Renjyaku
+- Torafuzuku
+- Ajisashi
+- Eboshidori
+- Eboshidori's satellites
+- Eboshidori's bombs
+- explosion
+- Ikaruga shot
+- small circular enemy bullets
+- medium circular enemy bullets
+- large circular white bullet (Eboshidori's final attack)
+- tapered enemy bullets (renjyaku fire these first)
+- enemy laser
+- player homing missile
+- level background
+- bitmap font
+- chain UI
+- Ikaruga UI icon
+- missile charge UI
+
+* Audio
+
+Make sound effects with sfxr.  See if there's free chiptune style
+music that is anywhere close to fitting the mood set by the real
+Ikaruga music.
+
+* Time management
+
+I think it's most important to get the intro phases, some
+approximation of the renjyaku attack, and the boss battle implemented
+to be close enough to the original stage 1.  other enemies and phases
+can be cut as needed for time.
+
+Hard to choose if chaining and/or missiles has high priority.
+Probably missiles.