Can I play Only Up 2 on my mobile phone

No, you can't play Only Up 2 on your mobile phone officially. Only Up 2 is a PC game released on the Steam platform. It is not available in an official mobile version at present. 

Some websites claim to offer mobile versions of Only Up 2, but these are likely to be false or mislabeled, and downloading from such sources may pose risks like malware infection or data leakage.