The nonlinear level design was super cool and the idea of upgrading the character is pretty cool too. I would suggest indicating to the player somehow that the slimes can’t be jumped on like in Mario, maybe adding some spikes to them.
Thank you for the kind comment! I will be adding in a tutorial that shows the interaction between the bread and the slime, so hopefully that will solve that issue. New upgrades will also be added, and some moved forward so the player can experience more of them!