Only a few things I see that I would work on. 

1. There is no countdown timer to the faucet.  It always says wait five minutes no matter how long since the last claim.  The only way to know when to claim is guess and try it.

2. It shows you info on the next upgrade for your building and other buildings, but no actual info about your current building, other than the picture.

3. Things like history pop down to that portion of the main page, but there is nothing like a history where you can look and see if your deposit has been received and is just waiting to confirm.

Just little points is all, great job!