I have a suggestion for future extra levels that have multiple colonies. What if you could choose which nest to play as? Once the system is completed, it would definitely add more interest to extra levels using it and allow players to spend much more time on these levels. This would also mean that the developers would have to spend less work keeping the players occupied and can spend more time into the story mode. And most importantly, it brings new challenges for the same level, like winning the level on insane with the weaker colony for example. This could also be based on the same mechanics that freeplay uses, so the level would take minimal time to develop and yet still be worth playing.