There are a few things I think you should fix:
1. I think, when planting a crop, that the money should be deducted after it has been planted. Sometimes I'll accidentally hit the cancel button or I'll want to cancel planting and I lose money. If the money was only deducted after the little bar gets to %100, then canceling won't make my gold disappear :)
2. It's kind of...really hard to save up money :(
I play the game, not excessively, but enough to take care of my crops at least twice a day, go to my friends' Flotias, and collect from my own buildings. Somehow, though it's taken me over a week just to get to 150,000 gold. I just want to buy the expansion so I can get more buildings, but this is taking forever. I think you should either raise the value of the crops or lower the price on the buildings.
Remember this is an app. Something fun for us to do, we want to succeed at it and earn all the cute buildings and whatnot, but you're gonna lose people's interest if it's this difficult to progress.
Aside from these things and the crashing I love this game :)
A lot of work has gone into it, and it's fracking adorable
Thank you for your hard work Rule The Sky creators :D
-LettuceLeaf