In the future, list everyone who worked on the project as a contributor on the submission. A submission that clearly demonstrates platformer mechanics whilst introducing some more unique experiences, particularly with the interaction with items.
I may have overlooked something, but the game fails to teach the player how anything in the environment works. If you have unique items in the game, clearly demonstrate or instruct the player how such objects work. Was fairly confused how the world interacted with another which made progressing through the game a test of patience. In addition, the cat seems to get stuck on objects incredibly frequently. Was this intentional? It didn't appear to be the case, but exploiting that fact worked was the only way to progress, due to the lack of understanding of how items worked.
All in all, this definitely demonstrates the fundamental basics of what make a good platformer, but there should have been a focus on actually teaching the player, indirectly or otherwise how the game worked. Think how titles like Mario teach the player about new mechanics. Good work overall.