I got really excited when I frist heard about this "reverse tower defense" or "tower offense" game. I played the first few levels and then it took me YEARS between then and ever feeling motivated to play the game again. I finally did and finished it and to my surprise it's only a couple hours long. Even doing everything I wanted to (bonus missions, mission-specific achievements, etc.) did not add that much time.
But I'm thankful for the short length, because I did not enjoy it.
The game's concept
is great, but the execution
is not good. Despite the fact that the game keeps introducing new enemies and units right up through the last mission - which actually sucked because you never had the full system figured out until the very end - I found myself oscillating between two very undesirable points.
The first was more common: most levels were so easy as to be boring, even on higher difficulties. The second was shear frustration: getting stuck. The checkpoint system is totally inconsistent, as in some levels it will repeatedly reward you the same check point an infinite number of times, so that you can just get it as many times as you want, even every 10 seconds. But in other levels you'll go 15 minutes of gameplay without one and then have to reload. Frustraing. Annoying. And because of the set paths and limited resources if you do get a checkpoint late in a hard level where you don't have much money or health or abilities it might actually be impossible to finish the level and you have to restart. Accepting that is a painful process, but in some cases it's the only way forward.
So for such a short game with a cool concept I feel like I got disproportionately frustrated and annoyed.
The icing on the cake is that the story and the dialogue are abysmal.