Polybius invaders

Polybius Invaders is a single-player game that features 25 stages of alien invaders for you to destroy, Four Brutal Bosses, and a Final Showdown with General Goo. To help you succeed there are plenty of weapon pick-ups. It is not designed as a lightgun game but plays very well as one!

Download it from Steam HERE

https://youtu.be/oO2ewngLQuU