The looping mechanic is pretty cool - I like multiplying a shooter and making copies, feels very at home in a retro style game. The friendly fire is a bit of a kicker though, I think it's quite difficult enough without that added in, specifically in defending the base. I think I did as much damage as my enemies. Art and sounds are great, really like this, has a very classic look and feel, and the controls are snappy, explosions are responsive, and the effects are on point. Nice work! :D