However the tutorial still feels very unsatisfying. In my opinion the best tutorial level was the train level from the old plastic plane campaign. I would suggest you revisit that level as a tutorial map. Omitting trains from the tutorial is a tragedy.
This ties into the need to address the closed nature of the tutorial. I'm glad at least you gave the option to continue at the end. With the new (expanding) tutorial there was enough content to be interesting after completion. Now the final map is tiny and uninteresting and completely exhausted in less than 30 minutes.
From FFF-342:
I understand the need to motivate the person playing the demo to purchase the full product but you are not helping yourself by being stingy and you're still in in this situation only now by omission of the gameplay elements that make Factorio shine / keep me up all night.A literal "It isn't what it says on the tin" situation.
P.S. I know I've said it before but not including trains is really selling the product short.