There's a game base here, but it could certainly do with a little bit more polish. I got to the end but there didn't seem to be a way to defeat the Slime King guarding the door? I killed all other slimes but my character just wouldn't attack the King.
Also, I feel like I should be getting more powerful with each level up, but that wasn't the case. Slimes dealt the same amount of damage to me and it took the same number of hits to kill them, so leveling up didn't feel rewarding.