I've made some slight balance changes to last and first, but I completely rebuilt the lighting, skybox, displacements, and spawns! Everything should work much better, and have less issues during testing, to allow for more gameplay-focused tweaks going forward!
Well, hopefully. I cut off a route to last for the attackers, hopefully made it easier to defend 2nd and last, and generally did minor tweaks here and there. Thank you all who played and/or left feedback!