Please don't hesitate to join the Discord and describe what happens so I can investigate this...
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That would require a "tutorial" (or documentation), but that's not in the scope of a gamejam I guess. I thought the fact you're sitting at the start and the obvious IEYTD influence was enough. ;)
Yes, there are a few brush presets (in the Brush panel) that show what's possible, and I guess the Stamp brush is a good starting point for you. Please don't hesitate to join us on discord if you have questions.
It works under Windows, Linux and macOS.
Please don't hesitate to report problems.
You can create your own environments (using HDRIs that are available on Poly Haven, for example), and your own export targets.
If you can/want to install an older version of your drivers, it should work. Otherwise, 1.4 alpha/beta builds should be available soon for you to test. I'd suggest you join the Discord server to know when they're ready.
It cannot be fixed (AFAIK) before switching to Godot 4 (which is what I'm currently doing). It seems the web version works (but it has many limitations).
You may want to join us on Discord so you can use early 1.4 builds when they are available.
Please don't hesitate to contact me on discord so I understand what you need exactly. Maybe I can do something before migrating to Godot 4 (I absolutely don't know when it will happen), and this could help me anticipate future glTF related features.
You can easily customize exports: select the Material node, hit Control+W, click the pencil button, go to the Export tab, select the Unity export and remove the files you don't want (or you can duplicate the export target if you want both options). You can then copy your custom Material node using the node's context menu (copy and paste items).
Et si t'as encore des questions, n'hésite pas à me contacter sur Discord. ;)
Unfortunately, you won't do much with Material Maker without a decent GPU (all it does is generate and execute shaders).
You could still try to run from sources (you can easily switch to GLES2 in Godot's top right corner).
I just bought a Macbook Air M1 a few days ago (new, decent deal). I'll probably enter Apple dev program thing so I can sign MM 1.0 and Mac users no longer have Gatekeeper messages as first experience.
As for videos, I guess you're confusing with Arnklit who did many great videos about MM (I focus on coding and don't create videos), and also contributed quite a few nodes. And you may also want to check his "river" addon for Godot.