A few thoughts on navigation:
I'm on a mac and I felt that the zoom using the "scroll wheel" (i.e. track pad) was pretty disorienting. I was expecting it to scroll. Having to click and hold down to scroll doesn't feel right.
I also instinctively thought the arrow keys would work but they didn't. I'd suggest up/down (obvious) and left = zoom out, right = zoom in.
A few thoughts on navigation: I'm on a mac and I felt that the zoom using the "scroll wheel" (i.e. track pad) was pretty disorienting. I was expecting it to scroll. Having to click and hold down to scroll doesn't feel right.
I also instinctively thought the arrow keys would work but they didn't. I'd suggest up/down (obvious) and left = zoom out, right = zoom in.