First, thank you for testing. I like that you were able to test it out as two, because we weren't able to playtest that...yeah, not ideal to make it couch coop then in the first place but anyway.
I get your criticism, really. On the itch.io page we already mentioned, that the light zone spawning script is not ideal. I think we lacked a little experience in unity to really get that mechanic to a more or less polished state.
Sorry to hear, that you had such an experience, we are here to improve!
Thank you for your feedback!