Autofire survival games like this, magic survival, and vampire survivors all have one big problem to solve; how do you impose difficulty when the player? Survivor games like this thrive because they're more math problems than skill tests, having the player navigate complex upgrade trees and hunt for powerups and items to improve their damage to escape the hordes. without those elements, there's really no reason to do anything other than jsut stand there. this is the beginnings of a survivor style game, it just needs more elements to really get there.