Played it. And though if going by gut, it just fits the rewind mechanic in a sense of "if you fail, try again" with an interesting take on parallel universes. Overall, my view is it's playable, to a basic demo degree. With at least elements of audio and some variation on game-play.

May have benefited from actual instructions. Though hindsight, the trial and error game-play suits the premise well in my opinion.

I like how simple and easy this game is to learn. "oh look that laser hurts me, and its going through the boss maybe itll hurt them"  Although trying to get the missiles on the tank dude was difficult.

Gamemaker is a great software. That's what I use aswell. Your boss designs avery hard but very cool