The ninja controls very nicely and jumping around the level felt very easy to get a hang of. Art, animations, and sound are all great, they do a good job of selling the environment to the player. Unfortunately, I got stuck after 5 valves and had to kill myself because there was no platform I could reach to get up and no more valves on my level. As others have said, valves and chests are a bit hard to spot because of the colour scheme, but this would be a pretty easy fix. Overall very nicely made and a fun little game, nice work :)