This is Sakura Flamingo Archives. It's currently the most expensive thing in my collection; [PriceCharting puts it at $659, and earlier this year, some truly deranged soul forked over $969 for it. No video game is worth this kind of markup, but Sakura Flamingo Archives, especially, is Not Worth It.
iirc the dev for this project said on twitter or somewhere that all the programming and debugging/pre-cert was handled by a single person, and they got the game through MS' certification process by simply submitting it repeatedly with zero changes in the hopes it'd somehow make it through, and after a few tries, it did
the main creator of all those games moved on from KLON a long time ago but is still truckin' and still working with all his old Milestone creations (albeit with a stated aversion to putting out any more ports)—their new company is called RS34 and they've released a few experimental 3DS games (one of which was localised, and all of which are now commercially unavailable) and two new Switch games (one of which was released globally by a ramshackle publisher that's liable to disappear any day now), with a third on the way
they're weird and have become progressively less conventional over time and I don't even think I like most of them, but I can't help but root for dude
