Some quick feedback:
Outside of the slimes getting stuck chasing the X-axis position of the closest emplacements when they're a few floors below the target, the slimes are in an okay position when it comes to health.
Defenses are also at an okay position, as barriers can hold out against one wave of their appropriate level before the player needs to check up on them and heal... assuming the laser/Gausse defences are lined up efficiently. Although I'll have to do more playing with the shockwave emitter defense thing, as I'm still not sure how I feel about its usefullness.
When it comes to the cavern section of the game, I don't think I would've been able to realistically hold out against any of the slime waves if I decided to not get to high ground As Soon As Possible, since the slimes at each waves seem so overwhelming for what seemingly can be built underground; so I end up avoiding building any defenses and simply make a b-line to the other teammates.
The dialogue related to the big crystal undeground didn't fire for me, though it's been a while since I've played the 2024 versions, so I may have just missed the update that removed it.