Thank you for playing the game! Hopefully you enjoyed it. If you weren't able to get past the slimes, they work a bit differently from other enemies - rather than constantly moving towards you, they target what direction from them you are, charge a few spaces towards you, wait a moment, then repeat. Otherwise they work the same way, and you need to get the timing down to ram them while the animation is playing.
A dirty trick I found during playtesting is to get any enemy near a wall - you can absolutely stunlock them into a wall and get all our necessary hits in one go.