Ya'll are way faster than me!
I intended to take it a bit easy from the start, I actually only planned on getting the...well, plan, done tonight, but even after I went ahead and started mocking up the most fundamental mechanics up I still feel miles behind! All I have so far is an almost certainly over-scoped plan and this :

I have the basis for character movement and an extendable system for triggering interactions with objects going (the red box just shows the "interaction" area), but that's about it. In some ways I think it's an okay start, most of the potential gameplay is just different extensions of this basic system, but boy is there a lot left to do. I think the biggest hurdle is that I still don't know what I'm doing as far as the visual style of the game, and the aesthetics are going to be pretty important to the feel of it.
Hopefully I can figure that out tomorrow, along with getting most of the gameplay elements in place. For now I'm going to force myself to stop before I drop my casual approach, do a 48 hour binge and hate myself. ๐