Hey CavoX5 ~ That's a pretty creative game! good job.
I liked the visuals, the variety of attacks, the way you implemented "hitpoints" by shrinking the space. It's a simple idea but that works very well on many different layers. With sojme polish I could totally see this being a full on game experience.
My biggest gripe with the game are the controls. I have a german layout so the Z button is where the Y is and vice versa which makes the controls incredibly unintuitive. With W/A/S/D it worked a lot better.
All in all good job!