I love the hand drawn organic art style and colours!
The jumping felt fine in my opinion but the lack of check points was bit brutal. I was not able to figure out what I was suppose to do with the symbol change and moving platform. After 15 minutes of brute force I almost gave up until I just got it randomly. If there was a check point around the symbol change I would not mind the puzzle but the Dark Souls esk run back was starting to get tiring.
But besides that great work on the art and sound, keep it up!