the enemies are interesting and different from the vanilla, and the mega tank defending the huge ruin where the huge scrap piles are was an interesting and unexpected challenge.

but in the end it boiled down to this: the islands are way too hard to defend and defense on Fulgora is not fun.
There is already little space on fulgora and adding defense everywhere is not really interesting to do while the enemy can come from any direction.

Unlike Nauvis and its biters you cant build choke points (water, cliffs, walls). Some form of predictable attack location like Gleba and Vulcanus does would be interesting.
For example they could target your power storage, your accumulators like gleba does target your tree farms. They should also target reactors I guess, so players cant cheese the new enemies by not building accumulators.

Maybe make their drones discharge your powergrid when they attack accumulators and laser turrets to add a bit of flavour to them. They are using electricity after all.