An inverse Vampire Survivors, that’s really cool! And you also managed to put a power-up progression, that’s impressive for a game jam! A few suggestions: the non-clickable area seemed a bit bigger than the drawn area, it was a bit frustrating because you want to put the monsters as close as possible to the border but you couldn’t sometimes - even if it seemed like the place was fine; the mana for monster spawning was too forgiving, I could just spam click monsters, which made the game less strategic.
Besides that, I think it has potential as a bigger game too because there are interesting mechanics that arise from the combination of monsters - for instance, you could spawn fast bird monsters on the right and then, while the enemy is busy dealing with the birds, spawn an army of skeleton monsters to the left for the final blow. I’m looking forward to see if you are willing to expand it!