Very fun and simple, needs better income
I loved this game, its good as a defense game.
My only complaint was in the recharge time, but there was an upgrade for that, so I changed my issue to how fast you get money. It took 2 levels to get my first recharge upgrade (from lvl 1 of course, Im sure it takes less time later on).
The power ups were fun, I enjoyed the unfair edge Max Power gives.