Hey adfx!
About the UI, what I do when I'm developing my games is:
I look for games with similar genre and do some benchmark regarding UI. These 2 sites are great to do that:
It is good to follow the best practices of user experience (this includes UI).
More polishment as well, a clean UI is key because is the first thing the player sees.
"What kind of visual glitches did you see?"
I'll add a screenshot.
