The character controller feels like we're constantly dropping inputs for no reason, hitting the attack button slightly early completely fails to attack at all - not a great feeling when the attack is already quite slow, and any mistake means instant death. It's also pretty frustrating to not know what's in the other world until you mask/unmask, and potentially die because there was a wall there and you didn't know about it (even after playing a level before, it's hard to keep track of the *exact edges* of tiles you can't even see).
The concept and art are quite good, but the gameplay left me frustrated, and the lack of saves or any kind of health in the boss fight made me abandon it at the third teleport.