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"Includes out-of-the-box support for Epic Games Store and GOG"
Vanilla Ubuntu isn't going to offer you that level of integration.
https://github.com/ChimeraOS/chimeraos/wiki/OS-Comparison
A similar project is Ludo [1] which is part of the libretro family. More for emulation but really a clean UI (it actually has screenshots)
[1]: https://ludo.libretro.com/#about
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.