I think you are onto a really good mechanic here. The puzzles you came up with were really good and interesting.
I like the art style too, it's clean and makes it easy to read the game!
One thing I would change was the BLATANT LIE you told about spikes being friendly >:(!
Just kidding :) I would change the horizontal movement friction a bit. It feels a bit too ice-level like. Not a big issue though.
Congrats on making an awesome little game!