Just a few notes.
- I'm guessing this is just you running out of time, but the theme-related part of the game kicks in a bit too late, even if I do appreciate introducing mechanics one a time otherwise.
- The fact that the astronaut continues nonchalantly walking in place after getting spiked is a bit jarring, though I'll give you credit for making only the pointy bit of your spikes deadly.
- Did the pushable objects benefit from being able to rotate? At one point the big barrel spun around with me on top of it and did its best to pile-drive me through the floor.
- I'm not sure if the rewind mechanic always rewinding the full three seconds was an intentional limitation? If not, it might have been worth considering a second press of the button cancelling the rest of the rewind.
I definitely wouldn't mind playing more of this, were there more of this to play :]