A bit rough on the edges but the concept is definitely unique! Alternative mouse controls was a nice touch so that you're not totally hopeless if the enemies destroy the extra keys. Increasing the default movement speed would help make shuffling the keys around easier.

This a brilliant mechanics , although it needs some polish and audio work , a lot of potential , Excellent job !!! 

I've seen other games with keys as entities but this one took it further which was good. I liked the alternative but worse controls if you get stuck. I also like the difference between yellow and green keys and the different options for your keys opening walls/healing.

I was disappointed that equipping the same key to multiple shoot commands didn't shoot in both directions at once.

Also the physics of the game was a little frustrating you accidentally dragged boxes with your feet a lot.

I also wish you had had time for some basic sound effects. But thus is a gamejam. Good job!

I really like the concept of this, it can get pretty chaotic in the later levels and it's kinda cool how this turns the wave surviving concept into a puzzle of which key to replace with the persistent one and when. My keyboard has a different layout so I usually have to change it to qwerty before playing games that use keyboard keys for movements, but here I could almost do some sort of keybinding in game by playing well lol, super neat!