Invasion of the Mutant Space Bats of Doom
Spacebats 1 - Informal name
The game consists of 66 stages, arranged in some sort of pattern (for example, every type of bats you encounter takes 3 stages to pass, each of three introducing new challenges). Once every several bats you kill you get one of four bonuses - purple gems, 6 of which grant you another life, a green gem which makes your missiles faster, a red one which gives you additional missiles per round, or a white gem which grants you a time-limited "hyper" mode.
The game is very addictive and challenging, and the cliche' name/plot makes it a refreshing change from all the typical Space Invaders clones...
Tomer Gabel (4418)