It is a nice art style... Great way to show enemies life by cutting parts of them...
It is fairly simple to understand the mechanics, but the shooting + controlling felt a little weird sometimes... And the upgrade lvls didn't felt much impactful to me, the only one that really felt as an improvement was the 2x power gun after 4 lvls...
The music seemed interesting but I almost couldn't hear it, while the Power Gun sfx almost made me jump out of my chair kkk
I don't know why, but the full screen button didn't work for me in the first time I opened the game... It only started working after I lost the game and got back to the menu.
But the credits page also broke at that time... Showing the text without the background and the close button. I could still click Play... but the credits went into the game with me... I'm playing on Chrome as a browser.
And Man... That red text on the game page was really hard to my eyes...
Overall it was a fun experience. Good job.