Hey there !
So, there are a few things that can be clarified and I’m working on it. In the game, you can click the empty slots in the bar to retrieve the keys even when they’re off screen (it should be specified in the tutorial text).
About new mechanics, I want to keep the core gameplay as simple as possible, but still fun to use - the idea is movement, and sacrifying it to unlock paths.
Adding an item the way you suggest it would make the game a hassle to play, by slowing down the gameplay even more since you’d need to constantly swap items along with controls, and doesn’t fit with the core idea of the game.
Either way, thank you a lot for your comment, I really appreciate it ! A big update is coming soon (probably in a few days) where I fixed most of the problems that came up often.
Until then, don’t hesitate to follow the game or the Github repository ^^