Nice game + fun concept of leading the princess safely back. Except that breaking those green blocks: sometimes works w/ 1 hit, and sometimes it needs like 10 hits...
Also plz remember that in EU many don't use qwertz keyboard layouts. X+Z isn't very ergonomic for those using qwerty or azerty layouts. The Z key is where the Y key is. imo, X+C or S+D would be a more international choice.