I figured this'd be worth an ask, but give the potential this game has for a sequal, I think a level editor would go well to hold people over till then. Are there any plans for that?

The game is made in Unity, so chances are it's a no.
The way Unity packages games makes it so that you'd pretty much have to give the source code out to make it work unless you make a separate program entirely. I think this is the dev's first game so that's probably going to be a no for that as well.

Thats why I suggested once a survival mode or other modes should fill that gap of replayability. Because I see when you finish the campaing or do a 2 or 3 runs to test other weapons upgrades, there is no reason to play again. And I hope those survival modes or other modes, have modificators or more content at least. I mean, I love the game so Im in that spot where I dont want to end the game haha.