Cute game! I also love the level/ retro design choice for the levels! For feedback:
Fun: Yes! the levels could be a bit more special and some more enemies would make it even better but even now it does the job!
Core elements: I do wish I couldve save my shroom but allas. It did have the requirements to be a recreate tho so good job on that!
Polished: I do miss some parts to make it more "complete" I could just spam attack and a menu wouldve been nice, In your Untold game the menu is amazing so I know you can do it!
Audio: ofc the main audio is missing wich is sad but besides that combat audio is good and crispy
UI: I did miss this a bit wich is sad since ive seen your previous work wich was amazing.
Overall good job and I know a lot of the things I give as feedback are things you prob just didnt have time for. A gamejam wouldnt be a gamejam without time being an enemy
Good job!