Nice game!
I think the early levels are a bit slow and tedious (on normal speed). The enemies can also get stuck on terrains with their pathfinding so you actually have to go find them instead of being swarmed by enemies in Vampire Survivors. Upgrades have some good variety but I think you don't have to gatekeep more interesting stuffs like magic behind higher levels (or if you do, at the current speed of the game it's too slow).
The camera in the menu is kinda weird, you explain it that it was inspired from Resident Evil 1, but I feel like it doesn't work too well here.