Dangan GB is a free game, available for download on Itch.io (https://snorpung.itch.io/dangan-gb)
It's a Gameboy compatible (via emulator or flash cart on original hardware) Shmup that runs unbelievably well. Fast, no slowdown, bullet hell fun. 6 bosses make up the whole game, with their own patterns to learn. A wonderful, simple wee thing. Excellent "I've got 5 minutes" fodder, though my "I've got 5 minutes" turned into "Oh fuck, HOW long?" on my first session.
It's a Gameboy compatible (via emulator or flash cart on original hardware) Shmup that runs unbelievably well. Fast, no slowdown, bullet hell fun. 6 bosses make up the whole game, with their own patterns to learn. A wonderful, simple wee thing. Excellent "I've got 5 minutes" fodder, though my "I've got 5 minutes" turned into "Oh fuck, HOW long?" on my first session.