Fantastic game. The puzzles were challenging and well designed, I can see a lot of attention to detail was placed on introducing players to concepts and mechanics without spelling it out in text, which ultimately I feel makes the puzzles more rewarding to complete. Being able to press shift to see height values was also a very nice addition, I found myself using it more towards the end. Levels 21 and 28 were my two favorite for sure.
To me, this is a perfect game for Newgrounds. The simplicity of the design lends itself well to more complex mechanics being built on top of it, like the blue platforms in the last 7 levels. So I'd love to see more of those implemented if you decide to make a sequel