I'm also in the jam, and I know with more time everyone has a list of things they'd like to add or wanted to add. I try to provide the listed feedback in a constructive form to highlight different perspective as a player, and to show that I indeed did play the game.
- Very solid polish. A tutorial built into the first levels of progression is a very strong way to introduce players to more concepts.
- I did try to jump in the air when going into the doors; Thought it was a cool height increasing mechanism sort of like portal where you can increase height of the player on the output door to unlock other mechanisms.
- Around level 4 I felt like there wasn't enough flow to the game. Lot to hold within memory, especially when I died by mistake. I wasn't sure if I respawned from the start, a checkpoint, and then I got confused about the ordering of which way to go to complete the level.
- Wish the name had not been the theme. Something like, "Traveller Fox" and having it in the thumbnail bottom emptiness or the very top would have worked well.
- Just noticed the game's actual name is Somewhere Door, but itch page has it as "What's Behind The Door"
- Other mechanisms to consider in the future would be grappling hook
Solid game!