Nice minimalist design, and I liked the concept of battling your subconscious. Some elements seem to work against your idea though: the bright background (if your mind is happy, why do you need to fight them?), the lack of agency for kills (it feels a bit anti-climatic), and the enemies don't seem to be much of a challenge.
Perhaps if you made the background start off being really dark and gradually brightening as you kill off the enemies, and add an AI for all of the enemies: when you kill one, they'll run at you, but if you run away, they'll also eventually run away (playing a bit more on that subconsciousness idea). I can definitely see how this game could be really cool.
Cool, interesting concept! Maybe a short story would be of some help and the graphics maybe a little darker or something, as well as SFX/some music to set the tune.
It has a nice framework for something you could build some other ideas upon, keep it up
The concept is original, but it is currently too easy to be engaging. When I punch the shadows, I would also like to see something else than just them disappearing, 'cause I didn't know whether it was a glitch or I did something at the beginning :-)
Perhaps if you made the background start off being really dark and gradually brightening as you kill off the enemies, and add an AI for all of the enemies: when you kill one, they'll run at you, but if you run away, they'll also eventually run away (playing a bit more on that subconsciousness idea). I can definitely see how this game could be really cool.