The best way to check stuff out is to make a Japanese eShop account and go browse!
I still buy most imports from Play-Asia and then will pick up some occasionally from Amazon (U.S.!) if I'm in no hurry and they pop up on the store later.
There's not really a whole lot of import-only games out there worth checking out, IMO. Most of the games I import are physical releases that came out here as digital-only titles.
I have way too many Switch games, but for Japanese-only releases, it's just Dragon Quest Heroes I&II, Musou Orochi 2 Ultimate, and Senran Kagura Peach Ball...and that's it. The first two games are just ports that came out on other platforms over here and Peach Ball is very likely to get localized next year. Will probably pick up the Secret Of Mana collection that came out last year at some point, but am in no hurry to buy a Gameboy ROM and two SFC ROMs for fifty-ish.
So I mainly import physical releases of games we don't get retail versions of and will sometimes get stuff imported to play it earlier than 'Murica, since a lot of games released for Switch have multiple languages available. There's also some games that get released in English that will likely not be released outside of Asia, like Girls Und Panzer DX and DOAX3 Scarlet in a few months.
