If you have the numbers turned off to cut down on lag, it would be nice to have some sort of rollover tooltip to show the amount-per-click on the chest. That way, you could actually see what individual upgrades do to your bottom line.
Neat game and cool concept
I agree, some of the for-pay-items are a little pricey (more than I would spend) but a LOT of these people need to check their math... $200 for 4th slot - wow, no... + this so we can push Ezekiel off the 'Best' list
 "Idle Sword 2"){kind=icon}
 "Realm Grinder"){kind=icon}
 "Billy the Pilot"){kind=icon}
 "Swords & Potions 2"){kind=icon}