First of all, at least to me, the game moves waaay too quick. I just kept dying in the first three seconds to walls I just had no time to see. I would have slowed the game down a bit, made the ship move slower aswell, allowing to be able to make strategic decisions with my rewinds. Plus I'd make holding down the button to shoot continuously a possibility.
That said, it is a nice game that fits the theme, so great job!
We also made a space shooter if you'd be interested to try :)