A free demo is now available for Windows and Linux! It includes the full first level, with no additional alterations. Feel free to try it out and let me know what you think!
As always, don't forget to leave a review if you enjoyed the game, and thank you very much for your support :)
Update 2022-06-29: The demo now includes level e1m3 instead of e1m1. It has more content, and this is the level the original demo had, so it made more sense to have it instead.
- David
https://store.steampowered.com/app/1999140/Extraneum/