pretty fun. though i have a few notes if you'd have them.
1. orbiters work a little weirdly as the chase and just ending up behind swarms, id rather they go around the front of my swarm as a spear tip.
2. orbiters seem a little weak and could due with their own buffed upgrades with bigger gains compared to base particles.
3. swarm amount seems a little underwhelming in amount compared to the enemies.
4. rebirth is both very hard to achieve past the first and could use more content such as specialized upgrades or choosing to unlock branches of particles.
5. the tracking on bombers is weird and just causes them to freeze if there is more than one big group, and tent to blow up at the same time and thus be useless.
6. there seems to be little benefit to moving other than getting the two factions to attack, so having particles do better when moving in the direction of what they impact could work.
7.the multiple particle groups are great but could benefit from both more such factions and perhaps larger and obstacle filled enviroments.
so, its a great concept overall, all id suggest is some refining and adding more.