The story at the beginning is too long and in a font that is hard to read. It would be more helpful to have the story shortened, and explain the goals of the game. While the game is easy to pick up for someone who has played computer games before, it would be easier to have a small control list at the beginning of the first level.
While playing, I was able to jump so high, I couldn't get back down. I also fell through the level a couple times after jumping so high. Invisible walls don't always match the item it's attached to and in some area, it is easy to jump over or impedes the flow of the level. For example, where the "wood tunnel" bits are, there is an invisible wall that seemingly stops the player from getting on top of it, but there are items to get on there. You can also float over the stairs on some steps
The mismatch of art styles is a bit odd. It would be more cohesive if the pixel size of everything was the same. the color pallet is nice and easy to read.
The level was pretty long without much diversity in puzzles or obstacles. Many of us thought it was looping. Perhaps, shorten it or change the obstacles a bit.
Lastly, the "congrats" screen had moving buttons, making them hard to click