This was a very fun prototype to play! It reminded me a bit of a game I used to play a lot as a kid, but the additional dimensions of puzzle solving were actually quite interesting to explore.
I'm sure they're just temp assets, but there was definitely an incongruence between the design of the levels and the character and the dramatic opening. It's also a bit easy to get stuck in certain levels; I'd think a bit about making sure players have easier ways of recovering than just hitting the restart level button.
Overall though, I had a fun time! I'm definitely keeping my eye on this game as it continues to evolve.