I had some issues with the RMB movement and spacebar for movement - I kept accidentally opening up the developer tools on your game's web page lol. Otherwise, the inputs felt pretty responsive. I think you could improve the game significantly by adding in some goals to drive interactions between the main character and enemies (e.g. some exposition, an EXP bar, or some UI elements to give the player feedback). Additionally, it would've been great to see you lean more heavily into the main character's mutant powers! The head explosion attack was nice, but losing HP felt overly punishing.