The official name of the app
Pixelmator Classic

Is there a supported version available on a stable release channel?
No

Proposed App Status
Yes, works via Rosetta 2, no native upgrade planned

Proposed App Category
Photo and Graphic Tools

An Official App Download Page
https://apps.apple.com/cn/app/pixelmator-classic/id407963104?l=en&mt=12

Full Screenshot with the App and Activity Monitor(if self reporting) or Silicon Info