I found some incoherence with the controls - I had to press numpad 1 to start, and numpad 2 and 3 restart and quit the game, but to actually move the blocks I had to use arrow keys. You should've implemented 8/2 and 4/6 numpad movement. It was also a bit annoying that I cannot move the blocks to push the zombie back; this might've been intentional, to makethe puzzles harder, but it honestly just feels lazy.