Harper's Quest is the kind of thing I could imagine myself playing while waiting in line at a convention. It's rules-light, easy to explain (especially to those familiar with TTRPGs) and hinges quite a bit on GM creativity. For some people that may be less your thing, but personally I adore games that do the math part for me and allow me fill in monsters' aesthetic details with whatever comes to mind. This is helped by the clean layout (especially on the adventure sheets) which keep everything truncated and manageable. If you're looking for a bite-sized OSR dungeon crawl, this is definitely worth a look!