Maybe instead of having a badge for doing all of the easy puzzles, have an equivalent for doing one of the harder ones, because if you can do the harder ones, the easy levels are boring and tedious, and you'll obviously be able to complete them.
Like sudoku but easier. I also appreciate that the options for completing the math problems are shown when I scroll over the boxes. I would hate to hurt my brain doing simple arithmetic.
Quick for a hard badge. Trick is to just start lining shit up and eventually you just have a few that don't light up and you can puzzle those out pretty easily.
I see some complaining about not being able to replay levels to get more money... To me, that seems like a plus for this game. It makes the hard badge hard, rather than just a really long medium badge. If there's no potential to fail at the game and you get unlimited money, then there's no motivation to play well and no strategy.
Seems kind of odd to tie combo score to people/objects hit per second when this goes down with higher speeds and greater air time, lowering the advantage of going fast and staying airborne.
Small physics complaint: The magic speed is not adjusted based on the speed your character is moving. This is most noticeable when, while falling, you shoot down and proceed to pass your magic instead of having your magic travel in front of you. This makes it hard to shoot while falling.