The art is nice, monsters are very creative - but the game is extremely early/raw.
1) "Figured out" mouse controls before I could figure out keyboard controls. Mouse control is awful and I assume it's just some sort of a leftover? Walking animation doesn't play when you use mouse to move.
2) Web version is wonky. Graphics are too pixelated until you zoom out - then they "adjust" themselves to look better and not overly scuffed.
3) Upgrades are alright, but they are kinda underwhelming. Start is extremely slow, seems to be slower than the monster spawn rate - which makes it hard to reach the midgame where you are not struggling for survival.
4) Good job with monster progression, even managed to reach the boss. Didn't kill it though.
5) Grass texture gets too repetative at some point.
As others said - it doesn't stand out from other Vampire Survivors, unfortunately. Needs some sort of hook or a gimmick to make it interesting, because right now it's kinda meh.