veeeeeeeeeeeeeeery prototipy & buggy.
At the third stage I gave up fighting with the interface, and with having to restart from stage 1 at every death!!!
Idea is very barebone. Two characters, one can shoot, the other doesn't, to pass a stage bring the two together, loose the ability to shoot. I don't know if there's more to the concept.
Developed in Blender also, never seen anything like this. I found out something new :D