I'm looking forward to the finished game! I've loved your RPGs and this one reminds me a bit more of Brave Hero Yuusha than your Soma titles or Crescent Prism. The changeup in battle layout is a surprise as is the Sigil system. The whole setup with collecting treasures reminds me a bit of Wario Land 4 or I guess La Mulana or Pharaoh Rebirth. I don't usually see treasure hunting in rpgs outside of medals for tradeable-items, or just simply collecting equipment.
I've cleared the first boss and took a whack at the dimensional dungeon pit, which is I died for the first time. For the record I'm playing Normal Mode. The third fight did me in but I should've backtracked once I saw how much harder the mobs were. Overall combat in the game is fairly straight forward once you get the system down.
The game feels a little bit busy with all the stuff going on but I'm having a blast. Good luck with development!