The big difference with the trailer is because, as it clearly says in the title and in several places, this is an internal prototype build.
This version doesn't even reach the level of a demo. Normally builds like this are never released publicly. I only shared it so people who are interested in the project could try something early and see how the idea is evolving.
It does not represent the final game or the quality of the final experience.
Also, the game is not created with AI. Both the prototype and the final game are being developed by me — a single developer who has been working on this project for months.