There are two games named Only Down. One is free and the other is paid. The details are as follows:
The free one: The domestic independent game Only Down by OldCat Digital Studio is free to play. It's a platform jumping and parkour game released on Steam on September 11, 2023.
The paid one: The game Only Down developed by Quiet River is priced at $5.25 on Steam. It was released on July 26, 2023 and is an adventure, casual and indie game.