There's some cool stuff in this one, the variety of obstacles and the optional collectables provided an interesting challenge. I think the flow was pretty good, decent escalation in difficulty. I didn't manage to beat all levels unfortunately, though like the other entries in the jam that's more due to my time constraints than frustration or boredom with the games themselves.
I do agree with the suggestion of implementing the ability for the player to rotate their view, I found there were several times I couldn't see my character because it was blocked by something
Oh and though I didn't get too far into it I did see in the devlog that it was possible to miss the jumps to level ends that aren't on the ground. Maybe adding in a way to get the player maybe halfway back through the level would be a nice anti-frustration feature. Depends on how difficult you want the game to be I guess.
But I concur with the other comments in saying that if you pump more character into this game you could have something real fun. Nice work!