Aesthetics and sound are really nice but the controls are just extremely awkward and bring down an otherwise great game. I get you're supposed to grapple onto the rocks to build up speed but it just doesn't feel like you have much control over it. The hitbox or raycast or whatever you're using for the grappling seems really off. Sometimes I'd grapple a rock on the other side of the screen easily despite my cursor not being that close to it and sometimes I couldn't grapple a rock that was pretty close to me no matter how much I clicked and where my cursor was in relation to it. Can certain rocks not be grappled? It also seriously sucks that rocks can't be destroyed with your blaster. It just results in situations where you slowly hurtle towards your impending doom and there's nothing you can do about it because there's no other rocks to manoeuvre and the lasers from your blaster do nothing to damage it. It ends up feeling frustrating to play and not in the "Damn, I should have done X instead" way but the "I was not in control of that situation" way.
Despite that, you did a great job with the graphics and this is a solid entry. Nice work!