Fun puzzle just a few recommendations.
Make sure your movement is snappy, its really annoying to slide around when you your looking for orbs.
Add a camera pan to the exit when you get the final orb in a level, I felt as if I was doing the puzzle over again after solving it.
The use as E as interact through me off and I clicked trying to left click on the lever. Id recommend adding both.
Maybe think about adding another music track.
Other than that add more levels more mechanics to add more variety and more enemies. Fun game -Kolocop