"If something isn't broken, don't fix it" is what comes to mind about this game's release onto Newgrounds, having been already released on kongregate. The problem is that the developer instead opted for the same pay-to-play format instead of releasing a modified free version that possibly could have used Newground built-in revenue system. I've never been a fan of pay to play gaming ranging from online MMORPGs to Farmville-styled games, especially the later because both farmville and this game both incorporated micromanaging, interactions with other people, and a some-what addicting "One more minute gameplay". This game is an example of bait-and-switch marketing tactics, which if i really wanted to make money myself at the expense of my players i would also probably would do.
The only redeeming feature of this game is that it play brilliantly, in regards to being addicting, which be a plus if not for the unusual pay-to-play system incorporated in a flash game. But the game isn't really balanced in the regards that certain characters are always less useful than others, and if you happen to pick the wrong person, there goes several real life days gone trying to get another character or simply getting to the same position with one of the better characters.
The game itself is 3/5 but the pay-to-play system reduced that to only half a star.