It seems that red team has natural advantages over blue team for a few reasons:
1. Zones 02 and 04 have too many entrances.
2. Having zone 03 in two different locations will reduce blue team's fighting capacity.
3. Lack of cover for blue team in zones 02 and 04.
These are my recommendations to create a more balanced gameplay:
1. Move zone 01 leftward to the white area surrounded by four walls, some bricks, and boxes.
2. Add a two-tile vertical wall on the platform that's next to zone 02.
3. I can't think of much for zone 03.
4. Move zone 04 to the very right side of the map.