Mine's gotta be Gurumin: A Monstrous Adventure (2004)
Really tight, 3D-platformer-kids-game with some light RPG item progression and (
this is a stretch but you'd agree) Sonic inspired combat. Rhythm elements in the PC and 3DS ports (PSP was lacking for whatever reason...) Somewhat endearing characters, as cheesy and archetypal they may be. Overall a really nice kicking-back-on-a-friday kinda game that still makes you think at some portions and is engaging! Really good!
(Same devs as Trials in the Sky, the Ys games, and The Legend of Heroes)
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