Nice game! Not really sure what's with the powerups with numbers in it or the wrench, I think that might be buggy. The numbered powerups just pass through me without any effects as far as I can tell. And when I first see a wrench, it just keeps repeating its movement from the enemy diagonally down and nothing happens, as if it's stuck in a loop. Only after pausing and unpausing it goes away, but I can't pick it up either