I like the idea of the jump mechanic, but there isn't much that makes this a roleswap -- I can easily see a game where you play as a hero who has a dash that damages enemies. I realize why this is considered a roleswap, but it feels like there's untapped potential. This could be improved with more variety, such as having it so that the slime has more variants (ex. ice slime that leaves a chill, fire slime that burns). My personal preference would be to have it so that you can join up with other types of slimes in the map so you can launch a crusade against the heroes as revenge for the slimocide.