You did a great job having a lot of different upgrade vectors for such a simple concept of selling loot. Without more complex combat, there normally would only be a few verbs like kill -> sell -> upgrade, but you managed to squeeze out a lot more than that. That is the incremental way after all :)
The pacing is really good, especially for a game jam where we have 30-some games to rate. The upgrades felt good, and the automation felt even better. In fact, most of the time, I was pretty driven to move forward just to get to the state of full automation. You have a strong concept of how to apply incremental design to things, keep it up!