Very nice puzzle game. I suck at these kinds of games, but I still enjoyed it!
The graphics are very fitting and clean, I particularly appreciated the hand-drawn pencil style of the menus. I can see there's lots of puzzle variety aswell, and lots of scope to add more levels. The actual gameplay is very polished too. I can see you spent a lot of time getting the puzzle just right and adding features like the debug console kind of screen.
For improvments, I'd mainly suggest sound design. In particular, I'd say the main game music, while slammin', does not fit the aesthetic of the game. Also, it would be nice if your choice of game speed saved between levels (stops you having to change it to your preferred setting at the start of every game)
Overall, very strong entry. Good job!