I went for over 15 minutes before quitting, as it got repetitive after so long, and It didnt seem like I would die anytime soon. The initial difficulty curve is solid, but you can build directly at the enemies, using buildings as decoys to keep the enemies from shooting your main source. I think a help for this would be less random enemy spawning, where enemies don't end up bunched up.
I enjoyed the high level strategy, the game keeps you from worrying to much about specific buildings or little skirmishes, and focus on the shape of your base, which is a really nice focus this fun little RTS.
I liked the calm music and the minimal style, the presentation was clear.