In the end I decided to make a simple .tar.gz archive. Just extract it in your home/cpi/ folder:
https://github.com/timoinutilis/lowres-nx/releases/download/v1.1/LowRes.NX.GameShell.tar.gz
It includes only one game and one scroller demo. You can get more games from:
LowRes NX programs may work with a gamepad, keyboard or touch/mouse. The GameShell only works well with games that use the gamepad, so try the games online before and check if they are usable with the cursor keys.
Hope you like it!