I like the concept, and I think the mechanic has the ability to be a good puzzle game.
But the areas that can be improved IMO are:
- Sound design is a bit grating (high pitched).
- I think better looking graphics/effects would be nice.
- When pressing enter on the main menu it took too long to enter into the game.
The biggest thing that needs attention is the level design. The first three are actually good and introduce the concept well. But you then need to go further and expand on the concept and introduce more difficulty.
Still a really good effort for the 48 hours provided, and a fun mechanic that I think has some potential. :))