I have yet to play into the breach, just for the record. Sorry for no in depth feedback.
I managed to softlock the round where I couldn't click literally anything except for the menu while I had actions left to do, after performing a double suicide.
Pushing doesn't seem to work properly, or the level edges don't actually work as pitfalls.
Selecting tiles is wonky. Sometimes I can only do that by clicking a small top segment of it.
The action economy feels bullshit with only 3 actions compared to all the shit enemy side can do and spawn. I'd need a few smaller tutorial levels to get used to the mechanics and get familiar with all the weapons. Are the battles randomly generated? That's quite a brave concept since I would expect that sort of gameplay requires fine tuning scenarios by hand.
Should it be impossible to undo attacks?
The ambiance might be annoying when listened for a long time. It has those long resonating high tones that sound like they might give you a tinnitus.