So, good start here.
The game controls decently overall. I feel that they may be a bit too loose for the difficulty level that the game ended up being (I found it more difficult to move precisely through spikes or react to dangers). The ability to launch into the air with blocks was really fun and played well. The sideways launch didn't work out nearly as well though. There were some places that it was fun to play around with (namely, the downward wall slide section on the way to the grapple), but most of the time it didn't feel like it worked in a way that complimented the level design. The grapple ability was a good time to play around with though, with it being instant connection and flowing right into the swing. Wish I had gotten the chance to get to the "disassemble" ability, but I was unable to finish the game during my time with it.
Art looked pretty good overall. Environmental design was good, where the cave felt gloomy and contrasted well with the forest area. Choice of character sprite was good as their animation felt a bit stiff and sold the puppet concept. Only got a few bits of lore, which started to paint an interesting picture for the backstory that I'd be interested in searching out more bits of (though the first one I grab was a *very long* and may have benefitted from being split up).
On world design, felt that what I got through flowed pretty well. I wasn't too confused on where to go to get to the next milestone. First ability wasn't too hard to work out, though it would be good to have an area similar to the grapple upgrade, where the player is trapped until they understand the basics. Only really comment I have on it is that the checkpoints should probably be reusable. I presumed that this was a bug or oversight, and if so, that's cool, it happens. But yeah, I died at one point exploring out in the forest and was sent all of the way back to the grapple pickup checkpoint (which is where I had to stop, since running back across the world was a bit time-consuming).
I'm definitely interested to play more at some point, once some of the wrinkles are ironed out. It was a good start and had some unique and interesting concepts that could be fun to play around with after a bit of tightening up.