Things I liked:
- It isn't too difficult to get into a formation that locks the enemies out for many rounds while keeping the team upgraded, but you still have to stay on your toes or else the enemies will break through
- Simple controls
- Different field layouts for new challenges
Things I didn't like:
- Lack of enemy variety
- Game needs more sounds to emphasize key things happening, like transformations and upgrades. It could also use more variety in background music.
- Lack of end point. Unlimited growing enemy waves eventually get to a point where a once rock-solid formation starts letting enemies through.
Overall I really enjoyed this game and played through many waves on maps 1 and 5.