The Warlock of Firetop Mountain (2009) on DS
After trying the Oblivion PSP tech demo I was impressed by that glimpse of a Shadowkey sequel that wasn't. Wouldn't you know it, hidden in the DS library is a reasonable approximation of how it would have probably turned out.
Sure it could be improved in so many ways, but there is undeniable old-school charm in a barebone dungeon crawler where the only purpose is to make it further, get stronger and defeat the end boss. There's also no music apart from the credits song so out of combat you'll mostly be listening to the metronome of your footsteps. Overall its very minimalistic approach to atmosphere reminded me more of Arx Fatalis than the Elder Scrolls series though it's going to feel very visually familiar to Arena/Daggerfall players and
you'll likely find yourself humming the shop tune.
The visuals are an elegant mix of sprites and 3D environments and remain expressive throughout, some areas are way more loaded with details than it feels the DS should be able to handle. I just wish there were more beautiful or scenic environments; the pastoral path at the beginning is a real tease, same for the windy tower at the end. Speaking of the world, it's quite small and very interconnected, you keep unlocking new shortcuts to go back faster, so combined with the excellent controls it's never a hassle to move around.
There aren't many Western-styled RPGs on the DS and it's hard to say no to such a purebred old-school dungeon crawler.