I really like this! The air mobs are great. I love the lightning attack. The underground ones I'm a little more iffy on, if only because I can't seem to find a way to kill them. It sorta just feels like being punished for going underground. I'd also love it if there were some drops or xp from killing the air guardians, but that's more future additions if you were going to do that. Overall I really love the idea and it mostly feels great.
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First of all: thank you for this nice comment!
The earth mobs are meant as an barrier for the "the ground is the limit" part. However it was planed to add a drop from the air mobs that cancels any earth attack. There was just not enought time to get it finished. (mostly because I tested in a flat world and wondert why it wouldn't work on normal terrain.... cave air -.-' )
Therefor it will be added when I have some more time.