I'm pretty sure I got this one off of Vector.jp, but I can't recall where... the graphics are pretty basic, but the game is rather interesting, as it's a platformer type game with an overworld. Numpad to move, space to pause, and strangely Enter to abort the level. Many (but not all) can be defeated by stomping on them, mario-style.

The readme indicates the first game wasn't done at the time of the second game!? It also gives a shout-out to Bio 100%.