It would have been nice to have a text explaining what the crates do, as I've picked up one and saw no difference (I could not pick up the second one).
The others have pointed out the death-with-no-reason glitch, I experienced it too.
What could improve your game is to take inspiration from pacman.
Your map should have more walls, that the "ghosts" must follow too, enabling them to work in team.
The view could be a bit further too, to plan our actions.