I'm enjoying the game, but I get more and more frustrated with shooter-type games that make you collect coins. I'm not sure that we need more distractions on the screen. Also, I know I'm not far into the game, but so far I have not seen any coin-collection upgrades. Is it going to be this way the entire game?
Since the worst faults of the game have been addressed by many people already, let's look at some other issues. Price increases and money seem unbalanced, but it's hard to tell because game font is so horrible.
I feel that this game just adds more annoying things on top of the first game, without addressing some of the worst problems from that game. That said, it's still somewhat addictive. Fighting eventually kills it for me, though. I hate watching everyone "arrange" themselves on the battlefield when I'm playing a RPG, why would I want to deal with it in a action/running game? When you're in an actual fight, do you jump halfway across the room so you can pose after every attack?
100% Achievement should give you something, maybe a third diamond? Having achievements based on the elevator hide/show button is kind of dumb, though...especially clicking it 500 times. I probably clicked it, statistics, and achievements no more than 20 times each the entire time I played, then my OCD forced me to go back and click them over and over just to get 100%.
The only requirement to unlock the next difficulty level is to finish the last puzzle of your current difficulty level. If you play it smart, you can unlock normal by completing less than 50 easy puzzles, instead of 160.
I'm in two games right now, one with three robots and one with three humans. In both games, it is my turn to be the judge, and in both games, one card has been picked and I'm sitting here waiting for the other two. Even reloading the game doesn't help. There needs to be a timer for human player, and the robots need to react a lot faster.
It's very rare to find a game where I have to worry about how many quintillion dollars I need to get the next upgrade.
Don't get me wrong, I'm not complaining, I've actually found the scaling in this game to be pretty well done.