agreed lmao
I've already finished all of the first three levels, it's a bit challenging, but that's it.
As long as you play it smart (AKA use height advantage or camping major spawning locations) You can pretty easily get pretty high. All 3 of them I died not because I got overwhelmed, but because I finished the missions and got bored or failed a mission and had to restart.
Tip: Shack, get an auto clicker, farm the living shit out of the left side, and don't open the door until late rounds, that stops a few very annoying zombies from every spawning. When you do open the door, buy an LMG, and use the tree.
Tip: Cave, there's a platform to the faaaaar right that can only be climbed from the right side, just stand on the left ledge and camp. Don't let as many of them pass through and you'll have basically whittled them down to about half by the time someone sneaks by.
Tip: Jungle, there's a few houses + tree spawn to the far right, camp it with the wall buyable near the houses, it reduces their numbers crazily which makes the rest of the round super easy.
Tip: the orcs start blocking when they get shot, but they pretty much instantly lower their arms when you turn away from them, so just do a 360 and they'll mostly likely have lowered their guard. They're also super easy to one-shot with a sniper or shotgun in the earlier rounds, so be sure to carry one of those.