I never played the game, but i will sugest some things as a old school 1.6 / tf2 player :).
- Let only approved maps give you a Exp.
- Check for more cool mappers in GameBanana.
- Use only VAC.
- Add a voice chat to the game.
- Every Beta tester would to get more 2~3 more extra beta copies would to make the game more popular (like valve did with dota 2).
- Make a Workshop.
- Make a cool music player in game, like spotify or something.
- A better profile information like country flag, map created, avatars, etc.