The game is truly amazing! Played the campaign and the cut levels several times and I had a lot of fun.

Probably it's been asked before but, as the title suggest, would you consider working on a wave survival mode for the game? Many of the arenas already in the game have potential for an endless slaughter time lol: with random enemy types spawning in random locations, powerups and supplies popping up like in old arena shooters... you get the idea

Again, the game is PHENOMENAL and quick loading e4m1 on and on kinda gets the job done with regard to my suggestion but I think it would be cool to see an actual endless mode in the game.

there is a very good reason why there isn't one (and probably won't be):
I simply suck at making arena games 😔  (which I guess is kind of ironic)
attempted to make many in the past .. but well I don't really have an explanation
I'm just not good at making them🤔
and as you found out I try to make up for it with other ways (e.g. making enemies agile etc)

So no attempt on a horde mode?

You're breaking my heart 😔