Mine is a more normie choice, but I'd have to say Chained Echoes.

It's a JRPG made by one guy in Germany. Lasts 40-60 hours and manages to integrate both on-foot and flying mech mechanics together in a way that works. Plus, there's several encounters throughout the story that are unique and interesting, and the story tends to subvert a lot of expected norms in the genre.

The downsode is there's plenty of spots where the quality drops. There's a couple of scenes with bad and nonsense writing, a couple of poorly thought out encounters, and and obsession for dangling post-game content in front of your nose throughout the story when there's no need to make it post-game. Mainly, Mattias Linda really needed an editor to tell him "no" on some spots. As it is, I'd give it a 3.5-4 out of 5. If he had someone for proofreading and QA it'd probably be a solid 4.5/5.