Rinse, repeat
The concept of the game is cool
was cool
Youve now succeeded in making 4 editions of the same game without adding much new or intuitive that actually adds to the game at all
a re-hash of a re-hash of a re-hash
sure, it's prettier, but theres still the lag problems, still the inability to hurt something behind an explosion, still the same old same old gameplay.
Onslaught destroyed you in the "Defend you Castle" sort of genre, and you have nothing to even begin to rise to the challenge it set for you.