Because I just beat the windows version and loved it, it is on my mind.
Xanadu Next, originally an Nokia NGage game released in japan 2005, by Falcom whom also brought us Ys series and Dragon Slayer.
Loved the game, not sure differences in the windows and ngage version, id be surprised if there is an english translation for ngage. I barely handled an ngage when my friend had one, and it does seem kinda surprising that the handheld back then could run that game.
There is an open source symbian os/ngage emulator out there, recently released on Google Playstore.
Anyways that is my hidden gem of the day. If you like classic/midretro Ys check out Xanadu Next.