Only Up! can be played on the following platforms:
PC: It is mainly available on the Steam platform. You can visit the Steam store to purchase and download the game.
Mobile
Android: There are some unofficial ports of Only Up! on the Android platform. You can download them from some third-party app download platforms, such as Duoduo Software Station, 289 Mobile Games Network, Xiazaiba.
iOS: There is no official iOS version of Only Up! yet, but you can try to find unofficial versions on some third-party platforms. However, unofficial versions may have security risks, so it is recommended to wait for the official release.