This is an impressive project for 96 hours! I enjoyed the variety of levels and the lush art design. I do have a few pieces of criticism though, which I hope will be helpful (though keep in mind this is only my opinion!):
- The controls felt a little clunky at times. I think the main issue is that the player moves too fast, which made segments where you have to jump between thin platforms frustrating.
- In one of the levels, I kept falling down and activating the first checkpoint, overriding the checkpoint I had reached higher up and forcing me to climb all the way back up the level to try again. I don't blame you for this one - my game does it too! - but it's an easy oversight to make, so I thought it would be good to let you know.
- I think the "repairing checkpoints" system is flawed. Because you lose bolts upon death, which will potentially prevent you from activating future checkpoints, this system punishes players who die more often, despite those players being the ones who need checkpoints the most. Luckily, because there are so many bolts in the levels, and because you don't lose many on death, this shouldn't ever become an issue for anyone, but it's something to keep in mind.
- I found the last level quite frustrating due to the relative lack of checkpoints and precise jumps.
- This one's just me being confused, but are you supposed to be able to keep "repairing" the observatory at the end forever? The animation kept playing but my bolts weren't going down and nothing else seemed to be happening, so I just left the level.
Good work on this overall, though! I had a good time playing it, and it has a larger scope than I might expect for a game jam game.