You need more obstacles and cover, Snipers are gonna have a field day with those wide open spaces.
The cave route furthest from the hatch leaves the robots at a strict disadvantage, if you're going to have only two main routes, they should be equally viable for the robots.
The defending team doesn't seem to have any good positions to defend from. Notice how in the official maps, the defenders will have a distinct high ground advantage that they tend to stick to. Yours doesn't seem to have those, instead the players must defend from the same plane that attacks come from.