hmm, as there is no fish in the game, I think my pixel art is still low ;-) You play Win and Nim at the same time one is white on the left, and respect the direction you give (arrows), the other is black on the right, and do the opposite. you can slash the bubble mobs with your sword (space). you need to pick the right pair of keys to open the matching doors (left / right or up / down) you can then exit by the door and go to the next level. I'll update my description to explain a bit more.