Well, I definitely got some exploration time! The map does look good and diversified. Stay in one corner doesn't give the player any idea how the rest of the map is. But I can olny imagine the trouble of moving a Thor around. To solve the camera issue I guess you just have to move camera bounds a little bit away from map border.
For the tips and artifacts, maybe I'm just used to the way Blizzard explains things in the campaign. Even when I plan things for a map I usually try to make it Blizzard style. I got the feeling of a "mysterious thing" going on, but then no tip popped up, nothing happened and I got a little confused, no big deal.
Now the Obelisk doesn't look that hard to get. Isnt it a better idea make Psi Hunters and Scouts require separate buildings? Unless it is lore-related, if this is the case keep it the way it is. One tip for the Obelisk requirement interface: it looks "cleaner" if players see only one line for the requirement, like "Templar Archives, Dark Shrine or Fleet Beacon" than 3 spearated lines with "OR" between them.