I think this game could've thrived more in a longer game jam, but I still enjoyed what was playable so far! Oddly, the first time I played it had somehow crashed my audio drivers, so I had to restart my computer lol.
A sprint mechanic would be a nice addition, and to me the bounciness of the player felt a bit off (I got pushed off the path by objects that shouldn't feel bouncy).
Also, the blocks turning blue was a nice indication to understand they are solid now. As soon as I saw this I was hoping for some kind of "freezing" / stickiness mechanic related to that though, like making blocks that turned blue stick to other blue blocks. I think this could add a lot more verticality and complexity to future levels (although this would have to be limited in some way). I hope this is helpful! :)