It's neat, I would have liked additional firepower to deal with the sheer amount of slimes.
The feeling of movement and rolling around was nice, but compared to the speed of the slimes I was a speeding bullet in comparison. I didn't get touched by a slime until I wanted to.
If I were to update your game, I'd start thinking about how to add some combat diversity in terms of player attacks, and slime movement variation (maybe some lept or teleported to cut off the players route of escape)
All in all nice job!