Maybe add that toxic biters can spawn on Gleba (in the same way as the explosive biters spawning on Vulcanus)

Sounds like a good idea to me, even though I disabled Frost and Explosive biters on other planets for my first play through (want to have as little changes to the new planets as possible the first time).

Feels like something this mod is really missing compared to the others, would be great.

Gleba had the Pentagon pods and it's own mechanics there. Personally I think one of the modded planets would be better.

This is great idea actually. Or add them to Fulgora.

There's a great mod for pulgura that has robotic enemies that fits the theme. I think I modded planet or moon would be better. Like take all the enemies off Tera Palus and just have these. Corundum feels like another good option.