Mission VIII , some issues.

It is hard to see the enemy paths, maybe its because the map is so grey?  No such issue on the green and brown maps.

Is there no way to repair the colony? Nothing more disheartening than to upgrade it to level 2 and see it get an extra 250hp.

General issue, why can't we select all towers of a type or box select a few and do a upgrade of them all at once? 

And I finally beat it on Normal!