This game really blew me away to be honest.
There's something really unique about it, the fact it's made like an actual Game Boy game (and can even be played on a physical Game Boy if you have the hardware) really adds another level to it.
The art style reminds me of a mix of Pokemon and Links Awakening.
There's mountains of exploration to do, a mind-boggling amount of endings to find, a really deep and well thought out lore and story... it just seems to have the lot!
All I can do is recommend you play it for yourself, it's unbelievably free, and well worth your time.
Here's my playthrough for anyone interested: