Pretty good game. Really cool that you were able to build out the skill tree and all those abilities in time. First playthrough I died due to not killing the shooters fast enough. Only got to the 3rd enemy deer in that one. Second playthrough I was able to defeat the boss.
Sounds are just enough that all the major info is conveyed. The music is decent not super interesting, but does set the tone.
Movement feels good.
Balance is a little wonky in that I didn't really have to remove the mask once I got the hang of the skill tree on my second run. So adding something to make the mask mechanic more prominent would be better.
I didn't experience any lag after the initial shader load in on my first playthrough. Second run was smooth enough that I didn't notice anything.
I was kinda able to cheese the game, but first building bullet damage enough that there were no enemies on screen, then later build speed and health regen so I could just circle the enemies.
I couldn't really tell what my health was. Or when I took damage. I assume the small sound means light damage, and the big smack means big damage, but I couldn't really tell if it was me hitting the enemy or the enemy hitting me.
I bought health regen, but I didn't see a health bar. If it was that blood orb on the bottom right, that disappeared somewhere halfway through. Might have been the super aggressive vignette shader that covered it. I could only really see the center 1/4th of the screen near the end.
Boss felt a little easy. I couldn't see my health, but I got hit by one bullet from almost every one of it's attacks, but I think my health regen (2x health regen, 1x regen speed) and picking up ground stuff outpaced it. (Couldn't tell because couldn't see health bar.)
All in all, good job!