Cool game! I like the concept, the music and pixel art were really good, I thought it would be a vampire survivors clone at first but I like the addition of puzzles.
If I had to give some feedback:
-It is a little difficult to understand what is going on at first, since the enemies and text kind of blend in with the background, maybe play a bit with the colors
-Difficulty wise, the first level is really hard but then it gets a little too easy towards the end (side note: I did a projectile+haste build and the game seemed to not handle that too well, I was dropping a lot of frames)
Overall good job! You have a good concept that you can build upon here.