Arrow Keys to move. Use the space key to shoot a scale-shot, which is used to shoot enemies.
This is a rudimentary version of Fisher Lad's Return. The boss will be in the full game, but will be made harder in-game. I can not fully guarantee anything is set in stone yet, but it will be a long journey, so buckle your seatbelts, your pants, and enjoy the rest of your day at Kiiii-ngs Island!