The Demo is now Live!
You can now try out the first few tiers of content in the Idle Mining Manager Demo, which includes access to all the main gameplay systems. I expect the demo will have at least 30 minutes of content leading up to the unlocking of Tier 3 (the current end point for the demo). Those who want to unlock all of the upgrades and Encyclopedia content will probably get a bit more time from it.
In the next day or two I'll be patching the game with a few additional features and some quality of life improvements (along with any major bugs that are found!) From there I hope to continue patching the game every couple of days up to Steam NextFest in October.
Please let me know how you got on with the demo, if you encountered any issues, found anything you particularly liked or disliked. Also, please do leave a review of the demo on it's Steam page! I'll try to address any issues raised as quickly as I can.