Overall, a good concept.
The trouble though, is there is no sense of scaling, or progression. Once the 30-floor upgrade is bought, the game becomes so fast and unforgiving that it is near impossible to gain enough points per-run to see the other upgrades as an attainable goal. Not to mention, that the treasures do not go up in value, so the player isn't even rewarded for facing a tougher challenge. Possibly scaling the value of treasure/coins as you go up in level would be a good idea? Would have liked to see if there was an actual "ending" at the top of the pit, but the frustration and lack of reward were enough to drain my attention. Fun while it lasted, but not for very long.