A way to earn a little amount of money withouth playing(like do something with you merc when you are offline) just to have some money withouth doing mission(i have all the merc injured but not money to revive them -.-)
Don't know if you want to add with update but i think is really needed:
-stock the same item in one slot(x1 x2 x3 etc)
-buy much than one item per time
-See progress in a mission played(which achievements taken)
really easy....at first buy height band etc....then when you can buy radar and fuel sucker.....i reached mars in seven days, the same day i reached the moon.... bye bye....
p.s:if will be a third hedgehof launch please, more difficult....