I love Fossil Fighters! I miss that series so much. I do wish this game had a fossil cleaning mechanic as that was always what i liked the most about FF's presentation, but that would definitely be a ton of extra work for a game jam haha
The core loop of digging -> fighting and fusing -> reset map & repeat is pretty satisfying even with as limited as the game is, and the punny dinosaur names are so on the nose that I can't help but love them. The battle system is definitely imbalanced but i liked how your own fuckosaurs would gain a mixed debuff/boost as your playable character delved deeper and had to remove some clothes, and I could see that being an interesting risk-reward with some more polish.
FF's battle system is really cool, and i know you didn't have time to implement things like rotation, but if you do find time to add that in I'd love to revisit this! I never encountered the infinite battle bug, but I did have my inventory disappear a couple times when i went to the tent but didn't fuse anything.