Same, looking for a solution too.

you can change the resleation by adding one line in .ini located in
Documents\My Games\UnrealEngine3\MonkeyGame\Config

open MonkeyGame.ini
search for m_ResolutionValues=1920x1200 and add this in the next line
m_ResolutionValues=3840x2160

the 4k will be selectable bunot sure i the will give you 4K or not as i dont have 4k display so reportingback may help the others.
note: the subtitle will be small and couldnt fix it yet.

This works, thank you. I found this first on goggle but for some other extra tutorials check out: https://steamhost.cn/steamcommunity_com/app/245280/discussions/0/630800444209236730/ it explains how to use a better anti alliacing