Dungeon Royale is a retro style kickstarted boardgame sold by Gatwick Games.
You can get a preview of the rules here:
https://drive.google.com/file/d/1MBFtTezjks3rL77V6RlFE_qWYG3RSthD/view
It can take some time to master these rules, but I own and have played this game and I recommend it for you and your friends.