(There's no video for Microbe Swarm yet. Please contribute to MR and add a video now!)
Microbe Swarm is a B&W simulation of bugs flying around the screen. You can set how many you want.
Microbe-Swarm-1-0.sit (7.49 KiB / 7.67 KB)
Microbe Swarm v1.0 / compressed w/ Stuffit
Mac OS 4.x - Mac OS 6.x
Emulating this? It should run fine under: Mini vMac