Brilliant idea, fun concept. A few flaws, but overall a really good game.
Once I had gotten it, I wasted no time in playing in the sandbox mode. Oh what fun, handing Abraham Lincoln a rail gun and forcing him to battle with the Kraken. The first day I owned it I didn't even play the levels, I just messed around.
Once getting to the levels, though. The appeal slowly died down. Not enough to say it was a bad game, but it wasn't great. As I blazed through the painfully easy puzzle levels, I got stuck in the action levels often. The controls were tedious, and more often than not I ran into pits of lava or moved a helicopter I was riding, sending Maxwell to plummet to the ground, ridden with danger.
Just make sure you have a lot of patience while playing this game, the controls can be frustrating and the levels repetitive. All in all, it was still a good game, due to the amount of creativity used by the player to win the game. It was still a little lacking, but it's definitly fun.