Wow, thanks for the nice feedback and all these great suggestions. I
will see what I can pick up out of them. It's really cool to hear that
you can have already this much fun with the prototype even though it
is in a very early state.
You could solve your coal "problem" in the current version by creating
coal blocks out of 9 coal lumps and build a coal house ;-).
The hookshot is a great suggestions; I will try to do some prototyping
with this idea. Not sure about ladders as currently every surface is
already climbable. XBox controller support I would rather not add as
the game should be a VR game with VR interactions. Tweaking the
systems for another input method will affect the way I try to design
the game into a classical direciton. I think there are enough standard
games already there; I would rather like to spend my time on exploring
at least partially new things.
Music would be nice. But at the moment the game is in such an early
state and I don't know yet in what kind of direction it will evolve
and how the final feeling/mood will end up. But any CC licensed music
that fits I would use in the next iterations of the prototype.
Multiple worlds is planned. I need to code a simple save game manager
in the main menu and then it should be possible to create new
savegames (and also worlds with a different seed).