The part at 0:26 was really good, but then the song just became it over and over again...
Because this was used in a timed (in a way) action game it would have being great if the song had lot's of changes or "turning points" that were timed to wave of enemies incoming. And as the waves got harder the music would get more intense.
Of your game, this was the song I least liked. Still a fine tune.