I love these kind of puzzles! I think what held this back for me though was the lack of progression. If I had a set number of levels to complete, where things change a bit each time, I think I'd play for a bit longer. As it is though, I solved three or four and stopped playing.
The mechanics are great, it just feels like there needs to be a some actual levels to progress through, perhaps with larger scales or other factors that change it up a bit.
I really liked the sound effects!
(-Joe)