Simple game. I like that you had two different goals. My first run through, I just sot of dodged or just ran through everything to get out fast. Next time, I hunted the slimes down. I also liked that the slimes existed off screen. Firing arrows out the sides and then either immediately getting them back or having to go find them was a neat surprise.
I agree with a few of the post about needing sound. Just two sounds - "arrow fired" and "slime killed" - would enhance the game so much for the time I'm guessing it would take to add them. An "arrow hit a wall sound" would also be a nice-to-have.