Really beautiful art, the simplicity is on the point! Great choice of font as well (there is a lack in this so often). I love what you wrote about the sound design in the art thread as well.
For game design I struggle with the mentioned slipperiness also. And I am not sure if the time limit is really needed since the limited usage was already hard enough for me to complete the levels. Maybe this could be the hardcore mode? ;)
I guess after a bit of polishing with the gameplay you'll have a pretty decent perfect game! Looking forward to this!