Great game.
As for jump being the up button, what would you make climb, then? Because you need to jump and climb at the same time at certain points.
I think it's fine as it is.
Guys, is the amount the money printer prints supposed to be variable? 'cause it is, and by a long way as well. I get between 1k and 5k each time >.> (max upgrade, lvl 212)