In LVLEdit viewport (both 0.6 and 0.7 alpha) even a perfect cube (1x1x1) seems to be squished vertically. Additionally I've noticed something that looks like Y-shearing when rotating camera up/down (again, both versions, 0.6 and 0.7 alpha)

I'll take a look on that because at the moment I'm refreshing some UI elements. Fixing some old ideas.

LVL Edit 0.7 alpha 6b is finally fixing this squished cube effect. It was a wrong aspect ratio bug. Sorry for that.