Yeah, I messed up the mapping with the levels, so the starting levels are in the wrong order hence, the awkward in-game instructions and I do remember one of the areas accidentally leading back to a previous level. However, due to the little content in the game since this was made for GMTK 2025, the final level was meant to loop back to the first level (and unintentionally worked with the theme of the jam: Loop). But yes, my mistake with the mapping probably made it very confusing to play through and I could have made it clearer which level was the final level.
The boxes were not meant to be move very little when jumped on, my physics with the boxes were very scuffed so that is something I will keep in mind when I make boxes for any new projects.
Thank you for mentioning that the invisible doors could be interacted with, it seems I did not turn off their colliders at the beginning of the level if they started off hidden so that was a complete oversight of mine.
And yes, there is supposed to be no music or sound, I ended up not having time near the end of the game jam to add sound or music, nor have I worked much with making my own music yet. Maybe in future projects I will implement sound or music, but I don't believe I will for a while on solo projects.
Thank you for the detailed feedback! If you have any suggestions for the game, I would appreciate those too. I don't intend on working on this specific project for a while because I've been busy, but I did enjoy the concept I created for this one, so I have thought about making a new project using this concept (no guarantees, just an idea I've had).