Super fun little game! few things that stood out to me.
So later as you get further into the level, your ground is not as square and you start using a lot more triangle parts to round the overall feel of the level off. I think that should be done everywhere within the game. The edges of everything just feel a bit harsh compared to the rest of the art you have going on.
I wish i had an option to mute the music but keep the rest of the sounds in game :) i liked it but it took me longer then probably normal to go through the game. i wouldn't have minded muting it and just enjoying the rest of it or having that option.
Gameplay felt pretty good and so did the platforming. Great readability on the character the entire time.
Great job!