Thank you so much for the in-depth feedback :)
The physics are definitely rough - jumps especially mess with the responsiveness here. I feel like the panels that force a key down (control panels :P) are the worst part of the game, when they're pointing left/right; since they override most of your horizontal movement, which doesn't feel great. So, very fair feedback. It's also kinda an uncomfortable mix of thinking and action, something to be worked on for sure.
The key design - the game used to continue after collecting it, but the wonderful people testing often got stuck at that point (it's actually the intended route to go back to "planification" there and switch controls). I should just explicitly state that keys don't reset, rather than forcing the player back - as you said, it is rather jarring.
I do regret not listing out the controls, but I'll make sure to add all the possible keys in the description (as well as make a tutorial, after the jam). Thanks again for your thoughts, glad you found it an interesting experience! - Kevin