Nirosta, a display face

Hello,

I'm a designer learning type design right now, and I'd love some critique on my first typeface, an art deco-looking display face called Nirosta. I can sense that there's plenty wrong with it, but I need some help seeing what all the problems are. (I'd like to keep fiddling around with it, plus start another one soon.)

In your eyes, what are the main problems here?