The early maps help you learn the game and they get more difficult as you go, making it more fun than the way it starts out. There need to be more squares to place defense towers allowing the player to divert the bad guys into traps/mazes. I bought it after the cube pickup thing, so I cannot comment on that, but it sounds distracting from the tower defense aspect. I agree with many user posts that the zoom mode needs to be able to zoom out to view the entire map.
Positives: Learning curve/difficulty progression is fine.
Music is fine.
Power core countdown and warning is a plus.
NO bugs to report---I've seen too many early access and betas so, a finished game is kinda nice. ;) ;)
Negatives: Need more tower placement opportunities on the maps. -- Let us decide the route of the enemy. It's as if we have to merely figure out what route the game developer wanted us to make. This really limits the fun of the game and it destroys the "replayablity" of each map.
Zoom in/out is too limited in scope.
I chose recommend, because I like tower def. games and I got it on a Steam Summer sale price. If you can get it cheap, you'll get a few hours out of it. If you have a choice, Defense Grid is way better. I wouldn't pay the full $14.99, If they had a steamworks mod ability to let users make maps, it may be more interesting and fun.