There's a thread for people recruiting for a reason. And that is so people won't post their guilds on the comments section. Please learn from SrJordon's mistake, new GMs, which is to NEVER post in the comments section regarding recruitment to your guild. Again, there's a thread for that.
Maybe there could be achievements that awards us some gold/proto-part/elite unit. Achievements that can be earned during combat, or in your base, like "kill X amount of units" or "upgrade your base until all its buildings are at X level". If there ARE achievements, then it is not obvious enough. Gave this game a 5/5, so please keep up the good work!
Wish that we could find/hire soldier companions or survivors to help your cause, as suggested by other people many times. Hope you can incorporate this into your sequel, if you're gonna make one!
If this game is ever gonna go multiplayer (which I'm pretty sure is gonna kick ass if it does ;) ), I hope there's gonna be a guild or alliance system where groups of people may band up to fight other alliances.
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:)