I made this game for the Ludum Dare 46 competition: Whale Dive.
The rules of Ludum Dare is that you have 48 hours to create a game on a given theme. This time the theme was "Keep it alive". So in that spirit, I created a game for an old platform that we have to keep alive: One of the first game consoles, the Atari 2600.
The easiest way to play it is probably using the Web-based emulator.