Thanks for the encouraging and detailed feedback!
We really appreciate the time you took to play our game and share your thoughts, since this was our first game project and our first game jam, we learned a lot throughout the development process.
The comments about level design and platform placement were really helpful!
That's something we're already revisiting, eventually we'd also like to add hidden areas and optional stuff for players to find, but we're still figuring out the right way to do that.
Regarding the power-ups, our original idea was actually to create an inventory system where players could carry items and assign a limited number of them to a quick-use bar, somewhat similar to how item management works in some Monster Hunter games. However, since it was a fairly complex system for our current skill level, we decided to postpone it and focus on finishing a playable game within the jam's time constraints.
Thanks again for taking the time to write all this, it really means a lot and keeps us motivated to keep going.