Amazing presentation! I also really like the double or nothing mechanic; using your reward to get better rewards fits the limitation perfectly, and it a fun risk/reward decision.
Controls were also great (loved that you could still slowly move while attacking; that felt nice), and the gameplay loop is satisfying.I was a bit bullied by the thousands of little spirits, but eventually figured out a kiting strategy, rather than trying to actually kill them, until I summoned the actual bounty. (Also, nice navigation assists; that was intuitive and felt good to have!)
Great job!