Just a short feedback about the light in the levels:

Try to look at the screenshots when they are scaled to a minimum when it becomes difficult to 'understand' what's on the pictures. Then ask yourself whether it looks still interesting, whether it has a unique shape relating brightness and shadows and colors.

Maybe, this is for later, after finishing the levels and their mechanics, but to make your levels perfect, you should aim for unique places with a unique composition of colors, mood and light.

Maybe, looking for painted frames of adventure games is the best way to get ideas on how to improve such things.

Sorry, this feedback is a bit fragmentary, hope it is clear what I mean.