> You are right, the “e” diaeresis is still very rough and not yet finished. Do you see ways in which we could make this work better?
I think Christian's idea is very good: taking on attributes of blackletter would give this a worthwhile novelty but with the validation of history. Like I would love to see an "h" with a descending right stem! :-)
This makes for a great learning exercise, but to me it's too conventional to bother taking all the way to a finished product. As a beginner it's tempting to throw in novelty to escape conformity, but it paradoxically takes experience to know what works... Case in point: I think in this context the "e" diaeresis is just jarring.
Your curve quality is pretty good (except in the "a" and "s" – two difficult characters) but I noticed the following vertical alignment issues: your "g", "j" and "y" seem to be descending to different depths; the caps are as tall as the ascenders, which makes acronyms stand out too much. Also, the "u" is too wide.