I just picked up Unstoppable Gorg the other day, but have only had a chance to play a few levels so far.
My impressions thus far:
- I love the cheesy retro-50's sci-fi movie videos between the levels.
- This game has a fairly different "spin" on tower defense:
- The path the enemies follow is plotted out for you, but changes several times during the course of the level, possibly with multiple paths running at the same time. There doesn't seem to be any way to block or reshape the enemy paths.
- You can only place your "towers" (satellites) in the relatively few slot positions offered. I don't think I've seen more than 6 or so slots on a level yet, after 4 or so levels.
- You need to use at least two of your few slots for a money generator (to provide money, killing enemies doesn't seem to give enough on its own) and a research generator (used to earn upgrade tokens)
- The enemies attack and damage your satellites, so you need to pay money to keep them repaired.
- You can (and must) rotate the rings of satellites to reposition them to compensate for the changing paths.
- You can even constantly rotate the rings to keep a batch of enemies within the rather short range of a single turret. I found this necessary to do at a few points, but is more micromanagement than I'd prefer to deal with.
Overall, it's not the same 'ol tower defense, which is good, but the way it seems to be heading after my first few levels of play looks like it will be quite micromanagement oriented, constantly rotating the rings trying to keep your weapons in range and your vulnerable support satellites and damaged weapon satellites out of range. I haven't played that far along, so I don't know for sure that is how it will always be, but I prefer the more traditional attrition to the enemy by multple turrets over the course of the path, rather than trying to shift the turrets around to focus on specific ones.
About Defense Grid: that is my favorite TD game. From what I've played so far, Gorg is attractive and interesting, but is unlikely to replace Defense Grid as my favorite.