BEHAVIOR DIFFERENCES:
+ L1
	- underwater there is a water-motion effect
	- bubble motion is fancier in real thing
	- get out of water, you face forward unless key pressed
	  (we don't have a forward sprite as it looks weird)
	- arrival, the beast movement seems to depend on your xpos?
	- small things like birds flying are not implemented
	- beast on hill and 2nd screen -- complex, only appears if
	  you happen to leave same time beast does?  then movement
	  depends on xposition?
        - earthquake can happen while on rope?
	- sometimes falling rocks can follow you to next screen

+ L2
	- gun movement: gun is held by head when running
	- separate left facing vs right facing sprites


KNOWN BUGS:
+ ootw: pool monster grabs you a edge of pool (glitch)
+ intro: there's still a bit of a pause when the elevator door finishes opening

TODO:

General:

* Movement:
  + running: Missing one running frame (?)
  + ability to run+jump
  + ability to kick while crouching
  + ability to shoot whic crouching
  + running then crouch, you slide a bit

* sprites_to_draw:
  + physicist crouch-kicking
  + physicist crouch-shooting
  + physicist run+jumping
  + physicist swimming
  + beast tripping
  + physicist shot
  + alien shot
  + alien running
  + friend walking
  + friend running


* underwater:
  + ripples in water

* pool:
  + background of beast moving off
  + adjust tentacle to not go off edge of screen
  + adjust x position of tentacle grab

* cavern:
  + slugs on ceiling drop
  + background of beast moving off ?
  + adjust slug attack range

* beast:
  + hook up beast ending cutscene
  + compress/transparency beast ending cutscene
  + add beast tripping

* rope_room:
  + re-enable earthquake while swinging
  + speed up background if possible


Level/Checkpoint #2:

* general
  + If aliens catch you, they punch you
  + Shields disappear if you leave the room
  + Alien AI
  + Gun sprites/action
  + Implement door
  + Implement end scene
  + Shoot the wire in the basement

* cage room:
  + in game, after some time the guard calms down

* Jail:
  + Doors that open/blast?
  + flashes from gunfire in neighboring room
  + Implement enemies
  + death animation
  + in actual game foreground enemies can continue to next screen

* Elevator:
  + Elevator can change direction mid-floor
  + Elevator should shoot sparks every 20 frames or so

* View:
  + music play when viewing city?

Level/Checkpoint #3:
 + smoke
 + Poisoning
 + Only show a window around us rolling
 + Fix animation speed of rolling
 + Actual game shakes the camera when you hit the ground after falling

Level/Checkpoint #4:
+ Falling as enter level
+ Implement gun recharger
+ Implement doors
+ Implement guard
+ Add friend/shooting foreground action
+ Allow falling into pit/spike
+ Allow jumping to platform
+ Allow exiting level

Level/Checkpoint #5:
+ Falling as enter level
+ Allow falling into first pit