I really like this kind of game mechanic, although i've seen this "mechanic wise" better executed I liked the graphics, sound and music.
Why just 2,5 then?
Because of the scrolling, this fucked up the controll quite nicely, which is a really serious issue especially at the beginning of a level. If crucial bases are just out of screen its easy to miss them on the first click which prompted me to just restart the whole level because it would just be extremely hard to win otherwise.