Riviera has been released https://store.steampowered.com/app/2891280/Riviera_The_Promised_Land/, on July 16, 2024, just five days shy of the 22th anniversary of its July 12, 2002 Wonder Swan release. (Discrepancies in arithmetic may be due to time zones.)
It has a 20% discount (from $35 USD base price, in the US) until July 30, 2024. You can get a multiplicational 10% off (28% discount) if you already have Yggdra Union (through the https://store.steampowered.com/bundle/42659/Rviera__Yggdra_Union_BUNDLE/.) (Yggdra Union https://steamdb.info/app/2107860/ in the past year it's been out, so this is probably the best discount you'll get for a while, unless you want to wait for both to be on sale for a better bundle.)
Earlier, Riviera was released on https://apps.apple.com/us/app/riviera-%E7%B4%84%E6%9D%9F%E3%81%AE%E5%9C%B0%E3%83%AA%E3%83%B4%E3%82%A3%E3%82%A8%E3%83%A9/id6501970614 and https://play.google.com/store/apps/details?id=jp.co.sting.riviera in https://www.gematsu.com/2024/05/riviera-the-promised-land-remaster-now-available-for-ios-android-in-japan, but only in Japanese.
It was also released on https://store-jp.nintendo.com/list/software/70010000071834.html, in February, again only in Japan. The Steam version is the first English release of Riviera since the PSP jelly in 2007.
Someone add these new releases to https://en.wikipedia.org/wiki/Riviera:_The_Promised_Land.