The main issues i see in this idea of mine are- servers have to be able to support a LOT of players, and people may prefer a group 'vote' on what the upgrades are, instead of having a player be human commander or brood mother. I think it has potential as a multiplayer game, but that's just me.
I've replayed this game multiple times over through the years... it's a very multiplayer-friendly concept. Why it hasn't been looked into yet is a mystery. Broods vs Humans. It would be interesting to see a player that uses the gathered ether (human material for broods)- to upgrade the capabilities of the entire team, and based on the upgrade level, a certain amount of players can play as an upgraded ship (like the ally upgrades) the damage they do, the damage they take, etc. This would work for both teams, since broods also upgrade. Also, all the defending turrets could also be players that chose to take control as a defense turret. when that turret is destroyed, they then are forced into doing space battle as another ship or brood. .
Just want to point out that the music in this game can be found in a much older game. Specifically, it is from the second stage of Plankton life 2. it fills me with nostalgia. Unfortunately, Plankton Life 2 isn't on Kongregate, but the first one is. Go on and give it a try- it's a very old game compared to spell idle, but i believe it was the original game the soundtrack used for Spell idle was used. Unless there's an even older game it came from... on a more related note, this game is worth it just to listen to the nostalgia of my early online gaming days.
runs out of memory no matter what mission i pla... even the tutorial .-. dammit.. i had just gotten the hang of how i was supposed to actually win xD (it took me half an hour to figure out how to destroy the blue flooding in the first mission, i won tho finally XD)
 "Aisleen"){kind=icon}
 "Ether War"){kind=icon}
 "Spell ilde"){kind=icon}
 "Creeper World 3: Abraxis"){kind=icon}