Shiren the Wanderer: The Mystery Dungeon of Serpentcoil Island for Steam includes all of the free feature updates. The Plus Pack will also be released on Steam as paid DLC. Wishlist them now from the store pages below.

https://store.steampowered.com/app/2178480

https://store.steampowered.com/app/2862840

A huge digital soundtrack is also coming!
Featuring 109 tracks and totaling over 330 minutes, the digital soundtrack on Steam invites listeners to fully immerse themselves in the world of Shiren the Wanderer: The Mystery Dungeon of Serpentcoil Island.

https://store.steampowered.com/app/3193460