itch.io

you can do this using clones. Also, I broke your game. when you take damage from a zombie it disappears forever, if you group them up by running circles around them, you can destroy them all and only take 1 heart, making there be no more zombies. (in my previous post I assumed you were already using clones)

You have to memorize where they are when they go invisible. and when they appear for a frame thats them attacking you.  Making more of them spawn without some weird glitches was difficult and therefor cut out of the game and having a fixed amount of zombies