Thanks so much for playing, it's good to hear that it was a smooth ride for you!
1) Yeah, I'd say in z-sorting all of the sprites is the part of my game was by far the hardest technical thing to get right during development. I can rearrange the geometry in individual spots to fix issues like this, but at some point I'd have to overhaul the engine to fix it entirely. I do have some ideas of ways I could rework the sorting, but time is precious and I think it probably makes more sense to spend time working on content instead. I feel the z-sorting is mostly pretty good right now, and I assume that this is the kind of thing that people will stop noticing after a while, just like how some minor clipping is a relatively accepted fact of 3D graphics.
2) Thanks for this correction. I'm terrible at proofreading. ^^;;