So... for the first half-hour, I was unimpressed. To me, this looked like any other TD game... and I've played a few. Depending on mechanics, most TD's either encourage a sweeping strategy of back-and-forth switchbacks, or center around some inevitable loop-crossroads, where one can concentrate their firepower to best advantage.

At the one-hour-mark, however, I was struck by the unique-ness of being able to re-structure the entire defense grid at every turn.

A casual player will probably either become frustrated and quit, or otherwise write off the game as "another TD... ho-hum!".

After countless waves, I realized that I'd have to switch my strategy for every incoming wave - that the challenge lay not in mastering one specific strategy, or mindlessly upgrading - but in sincerely giving thought to how towers and obstacles can be rearranged to present the highest grade of difficulty to your attackers.

In the short-run, this game is tedious. It takes forever to level up your permanent statistics. The music is lacking variety and interest. The graphics could use a helping hand.

In the long-run, this game is a master-stroke of forcing a player to be intelligent - not by using brute force, but by using strategy - every round.

If the graphics and music were improved, medals added, and level-up rewards expanded, this game would be a strategist's dream come true. Easy to learn, difficult and engaging to master.

A little tweaking, and you'd get 5 stars from me, and that is not something I offer lightly.