Thanks for giving TTS a go :)
We originally planned to make much more to make the player think about their ship's positioning, from special moves that can be pulled off when together and environmental effects to force them apart. Sadly we couldn't get it all done due to Time Constraints. Right now there are more and more enemy patterns which incentivise the player to split the ships apart the farther the levels progress, which culminates in the final boss, but you are right that there isn't much more to encourage this spread-apart playstyle.
Maybe we'll rework/rethink the game outside of this Game Jam at some point. When we actually have the time to implement all this stuff xD
Regardless, thank you very much for your constructiveness. We're glad you enjoyed our game :D