My biggest feedback from the little time I played would be:
Implement a button that just fills all of your slots with something available of the currently ready glyphs. My first own glyph I created was only stat giving and created a new attack every time advancement. Thus I spammed the entire lane full of attacks. But I was creating more than I could place down in time. Meaning I had to stop time, place all of my attacks. Wait one advancement and then do it again until I placed all of them. This is very tedious.