Yea there's a demo right on this very page.
https://fpv-freerider.itch.io/fpv-freerider
Look towards the end of the page, there's a red button where it says "Download Freerider Linux demo"
There's a Linux demo for Recharged too:
https://fpv-freerider.itch.io/fpv-freerider-rechar...
Hope it will run well on your setup!