The game is a very clever use of the theme (ignoring the E key ;). It's a compelling little puzzle game.
Recommendations:
- The keys get in the way of the game view. There's plenty of UI space, so that's an easy fix.
- There need to be instructions somewhere. It's not obvious what the blocks do.
- Better colour palette. The game blocks should be a different colour to the background. You've currently got purple everywhere, for everything. Colours should be used to distinguish different elements of your game.
- Better music, it's just a very short and simple loop repeated.
The idea is there, but it does need polishing.