Just wanted to pop in here and let everyone know this game works wonderfully on the Steam Deck by using EmuDeck with RetroArch installed! If you have any audio issues with the GBA emulator, make sure your steam deck is set to 60FPS (I typically have mine on 40fps to conserve battery life)
As far as the game goes... it is absolutely incredible. Thoughtfully designed and truly delightful. I am still fairly early on in the game and cant wait to see what else is in store :D