Hello! I'm happy knowing you put so much thought into this, as this gives me the opportunity to mention some of the fun stuff going on in the background that not too many people asked about. I won't mention anything which spoils some of the mysteries in the game but on the topic of magic systems/world building I used to be a pretty big proponent of "hard" magic systems with very precise, specific rules and extensive appendixes. I changed quite a bit over time and Minotaur Hotel is one of my stories where I diverged the most of that approach.
As a little piece of behind the scenes information, the "magic system" we use was largely inspired by a thought experiment in a book I was reading during some academic research I was engaged with back when I started writing Mino Hotel. I won't say which one now but eventually I will, and that will give people a bit of insight on how the "magic system" works deep down. What I can say right now, however...
What I mean is : protagonist provides will and imagination and the labirynth provides the energy condensation into the shape and form willed by the protagonist. WHICH ALSO MEANS that with a well developed imagination he could create a lot of different effects like chocolate-flavoured grapes or flammable gold.
...Is yes. In the upcoming build 0.3 this will be explored but the labyrinth will materialize things if the master can provide information on what it ought to be like or if it's catalogued in the appropriate language. By this I mean that, yes, if a master is "capable enough" he could create things which do not exist otherwise, and later down the line the master will learn about deeper/more impactful ways to alter the labyrinth down to more fundamental levels. That will become more apparent with time, that the labyrinth's inner workings function on hierarchical levels.
That said there are things in the labyrinth which are set in stone. So far we've seen that contracts have a binding effect in the labyrinth, for instance, but they can't go against these stated principles of the labyrinth. The master can't write a contract that sets Asterion free. To make a law analogy, ordinary laws/contracts cannot go against constitutional law. But, much like real law, you can find loopholes!
This contractual approach to how the labyrinth works and what goes into materializing objects is one of the more surface ways to tinker with the labyrinth, mind you.
Now, in all of this I did not speak much about the occult and the gods because that's something we are going to see as the story goes along. I hope these stray thoughts were interesting to you, and as we go along we will explore these ideas in ways which, I hope, you'll find entertaining.