Just finished DG1 and the first expansion: Borderlands on X360, which was given away free via Games With Gold during July 2013 and is now X1 compatible.
I’ve completed all levels without losing any cores and tried using the minimum number of towers. There’s a ranked hi-score table for comparisons with friends and all other players, so have a go at beating my scores/tower efficiency.
It’s a great tactical game and apparently one of the best TD games - I really enjoyed it. Some of the levels are really tough and there’s a satification in refining strategies and visible progression towards level completion, but some of the levels I managed to complete first(ish) time. I found the upgrades essential in creating devastatingly efficient killzones in which I loved watching the alien annihilation.
Some of the towers are fairly redundant (Command, Tesla) as there were other towers that were more effective, and were only used on a couples of maps, sometimes as experiments.
I would be interested in seeing any videos of your solutions to the maps.
Gameplay vid opening level
Defense Grid 2 is available on the X1.