Incredible for a game jam entry! Everything from the sprites, sound design, music and UI are very impressive and perfectly fit the NES theme. It's a very technical game (must have been a challenge to get everything working properly!?) but easy to get your head around the mechanics once you get going. I could absolutely see this being a genuine NES game back in the day - also the CRT filter is great and really sells that NES feel.
Thanks for the kind words! Once the dungeon crawling and battle system loops were in and working together it was pretty easy to iterate and add new content with the systems we'd put in place. That said, those weren't in place until maybe two or three days before we had to submit so it was a mad rush to get in as much as possible and then balance it. We definitely got some things right, but we also had a lot of bugs and a few things that maybe didn't work out.