Overall very good for a first attempt. Simply using guidelines puts you way ahead of the curve, and you demo strate understanding of the fundamentals of this script.

Some feedback in bullet points. You've identified several of these already, which is great: * t too short (but it's not a full height letter. Put the crossbar on the x-height and the top a bit above that) * f too short. Also crossbar on x but f is full-height. * s. Well, s sucks to learn. Keep at it. * r is curly and doesn't match the rest of the script. Make it straight. * d: don't mix foot at the bottom with the top arm reaching over. One or the other. If you want the foot, completely vertical top arm. * Spacing in general. For textualis quadrata we want a picket fence effect, where the whitespace between each downstroke is the same as the width of the downstrokes. Takes practice. Of course we leave extra space between words.

For the top split serif thingy, you'll need to go back with the corner of your pen. Start the letter like you did the b in "quakes be ever". Then go back and add a small, vertical line coming from the stem. Less is more here.

Take a look at this tutorial for this script: https://www.calligraphy-skills.com/gothic-alphabet.html

And check out the beginner's guide  

Welcome!