everyting shake it off said, but also: less money per lvl, more lvls and maybe some music, let us upgrade the tank as well as the building, give us a variety of enemys and perhaps a few bosses. your headed in the right direction, i had fun :)
Loved the style. needs some work yet though, perhaps new chars to be unlocked and more areas. would have been 3/5 but im bumping it up to 4/5 because of the flaming farts!