Thanks for the feedback and yes the limit is level 3 in the demo i will add some description that it is the max level you can reach in the demo and glad that you enjoyed it. About the tutorial i think that took a lot of work because in the previous version most complains and feedback where about the tutorial, i still want to improve it by using less text and more videos or images.
Good to know! One thing that is still unclear to me is how to upgrade a building. When I click on some buildings they have products that require an upgrade, but I haven't found that feature in the demo. Is that also only part of the full game?
Edit: nevermind, I answered my own question through playing! The "upgrade" here also refers to the usual tree of upgrades, not to upgrading the building itself.