Slyia

The natural hatchery could be moved one cell to the left (assuming bot right spawn) to allow for Zerg to have a proper wall, else it's currently 1 cell off.
Main might be a little too large, could trim off the arm-side a bit.
I don't think anyone will ever mine out 2.7k worth of minerals for the tiny wall those patches are in.
I'd remove the small wall by the gold completely and replace the large mineral wall with those, otherwise it's incredibly difficult to attack the diagonal fourth base. Having both of these major paths blocked off promotes too much turtle play.
There's quite a low base count for such a large map.
It's a bit hard to see the reaper cliff.