Suggestion: Have only collectors repair, rather than also having Guardians repair. It's rather difficult to destroy a fleet of 20 repair guardians.

while making the collecters revert to a healing state when needed will work, it would be more interesting and add more flavor to the hive if they actually had a hive healing bot, sole perpose was to make sure bots maintained there health, and were assigned to groups of helmans, or other guardian squads. This way bots don't have multipule roles and there are more types of bots to kill.

I really hope, now that queens are hard to kill that we get a queen hunting mission, and a levy epic mission.

That would be the driving factor.
Just give us 5k xp per queen, 15k per levy. Make it spawn every 6 hours or so..... And we'll kill those bastages faster than you can repair 200k hit points!

/givemoney Devs 2c