Some position imbalances:
-Bases like Blue's ramp leads out into open while Teal must walk through that narrow path to get out.
-Blue's base has a small cliff behind the mineral line, allowing tanks to be able to hit there, while the other bases you can't (except maybe purple).
-Red has an island significantly closer to his main than everyone else. Possible fast CC float, etc.
+With a few changes, this could be a rather good, playable map.