Looking good. Whats with that room full of keys? It looks nightmarish to have to pick up that many keys... (Guess its just a demo thing)
Also I think its absolutely fine to release a physical copy via pre-orders and then sometime later make the adf freely available.
I think a physical copy excites the shit out of people and is more desirable.
Depending on the quality of the finished product 10 to 15 euros does not seem an unreasonable sum to pay.