So, I’ve played a bit more of Eufloria. My progress through the campaign mode has slowed. There are 25 levels, and my first session took me through levels 1-10, but my second only took me through 11. It seems easy to get into quasi-stalemates, which surprised me a little, because you’d think that whichever side has more trees would be able to just outproduce the other. But there seems to be a population cap for each asteroid, or perhaps a production cap — a total number of seedlings beyond which it won’t produce more until some of them get killed. Probably the latter, because that’s the mechanic used for the orbital defense platforms occasionally produced by the defensive trees. It’s easier to observe with them because the limit there seems to be one per asteroid. But I’m really not sure about the rules, and I’m going to have to learn more before I play much further, either by finding info online or just by observing things more closely.
The tactics so far haven’t varied a great deal: you wait for your asteroids to build up an army of seedlings, you send them to storm enemy asteroids. Defense seems to be a lot easier than offense, at least at the stage I’m at — I’ve only recently received defense-enhancing gimmicks like aforementioned orbitals, and if there are corresponding offense-enhancers, I haven’t reached them yet. This encourages the turtle-and-rush gameplay, with a substantial delay in conquering asteroids when you’re in rush mode, because it takes a while to claim them fully: even if the enemy isn’t defending an asteroid, it only changes ownership once your seedlings have worn down its “energy” by sacrificing themselves.
The one useful tactic beyond this I’ve found so far is divide-and-conquer, splitting the enemy territory into separate pockets. And it’s kind of interesting how this interacts with the movement rules. There’s a limit to how far away from the asteroids you own your seedlings can go, and there’s a limit to how far they can travel in a single jump between asteroids, but seedlings are quite capable of using an asteroid you don’t own as a stepping-stone to get to their destination more efficiently. And the enemies are no different. If you attack an enemy asteroid, the enemy will often send seedlings from other asteroids to defend it. If they have to go through an asteroid you own to get there, and if that asteroid is bristling with defensive trees and orbital platforms, you basically get to take shots at the enemy forces for free. I’ve got to try taking more advantage of this, by doing things like repeatedly sending small waves of seedlings at two separated asteroids in order to make the enemy keep shuttling back and forth through my defenses.