In Anthony Luna‘s game Hunger Shark you navigate a hungry shark desperately in the search for food! But be aware… you are not the king of the sea, you do have enemies as well.

Release notes:

-Removed Vertical and diagonal drift
–This has the added benefit of freeing a ton of space, I kept horizontal drift (that never completely stops) because of many shark species tendencies to never stop swimming. Vertical and diagonal drift didn’t add much to the game. Along with a small speed boost to the shark the movement feels more ‘unique’.
-Treasure Spawns now last twice as long.
-As a result of a ton of removed code saved for movement, the game is, as far as I’m aware, 100% stable in scan line count.

http://atariage.com/forums/topic/220865-hunger-shark/