At the moment all zones are created in the most generic way to be compatible with anything that goes. Although right now the game supports only rectangular shapes of play area. I'd love to change that at some point. In this week I plan to create the first zone that requires a larger play area. I have plenty of other ideas how to use the larger space and will be trying them out.
BTW in the options, you can adjust settings for play area, like horizontal scaling. This may make the world appear to be a bit larger. Up to 15-20% upscale should not induce motion sickness. If it does, try a lower setting. There are people who are fine with 100% - not me, though :( First I feel like skating, then it goes downhill. But the world appears much larger.
As for the narrative, yes I do plan to include voice-acting :) Send me an e-mail at contact@voidroom.com and we'll discuss things there. Is it ok? :)