Don't worry about the music - I got the guy who did the soundtrack for "The Case of the Golden Idol" working on music for the game, complete with a dynamic music system that changes based on whether or not you're in combat!Assuming all goes well, Episode 1's music should be complete by the end of the year.
The control rebinding is weird sometimes, yeah. I think that if you just hit 'reset controls' and go back into the menu it should be fine from thereon. Like it does that for every first time play of the game, so then every new version of this demo would have the same issue, but I'm not really sure.
I have tinkered with the gravity thing once or twice and haven't really found a setting that feels 'authentic'. I've never liked platforming in FPS's so I've been avoiding adding stuff like that. Kind of the same reason I don't want to get too schizo with the mazes. Filler is one thing but I want it to at least resemble something.
As for the texture filtering thing - it's because Unreal Engine handles texture filtering on a per-texture image basis. It's literally only just now that I learned that Unreal has a means of mass changing properties like that - so the next demo should have more consistent texture filtering.
And the spear - for what it's worth, is an AoE weapon that stuns enemies in an area and has a chance of instantly killing them once they come out of that stun.