That was really fun, I’ve played a few Vampire Survivor-like jam games before but it’s one of the most polished I’ve seen aesthetically, great art and audio. The weapon system is also really fun, the spell pool was enjoyable to work with. My favourite weapons to use were Wrath of Nature and Void Pool for the wide effect range.
I swear sometimes it picked random spells for me other than the one I pick; if that is an effect related to sanity (which I assume is the timer/health at the top), I don’t think the game makes it clear that an effect like that or anything else will happen, I think the mention would be nice if that is the case.
I also agree that some enemies can be really hard to spot against the floor, would suggest giving them more of an obvious shadow or altering some colours.
Great work overall!