Costume Quest & SOMA、epicgames、RPG & ADV、SOMAは有志日本語化有りらしい
https://www.epicgames.com/store/en-US/collection/free-games-collection

参考
最近のレビュー:非常に好評 (10)　全てのレビュー:非常に好評 (1,761)
https://store.steampowered.com/app/115100/Costume_Quest/
最近のレビュー:非常に好評 (157)　全てのレビュー:圧倒的に好評 (15,579)
https://store.steampowered.com/app/282140/SOMA/