@DarkPath To answer your question, I downloaded and tried both.
BUT I managed to get it working. It's weird though, I had to use my RetroFighters Wireless controller on my Dreamcast.
I originally tried 3 official Dreamcast controllers. They work on every other game (official and homebrew). But didn't work on this.
But the wireless RetroFighters did work! Really not sure why 🤷
But awesome demo! Great to see what could be possible in future for indie games! 😎👏👏