Congrats on completing the jam! I found it similar to vampire survivors but with more clicking. I think other commenters have made some good points. I would also suggest some sort of indication on how long it will be before the necromancer spawns - there was a good few minutes of wandering around obliterating everything wondering where he was or when he was spawning. I wasn't sure whether it was time based or level based or enemies killed. When I found him I basically instantly killed him.