I really liked the idea but I think the execution needs some tweaking. If you shoot a key far from wasd the game is pretty much impossible to play because you need one hand on the mouse and can't reach all the movement keys with one hand. Even if the key can be reached I found it very difficult to dodge the bullets after switching keys. Also, check your Godot settings. I had Windows set to 125% scaling and when I first launched the game I could only see the top left portion of the screen. I had to go into display settings and change the scaling to 100% for this game to be playable.
Still, a really good idea with nice simple graphics but too difficult for me.