A quick disclaimer: I'm only a beginner. I've been doing type design for just about two years and also very new to OpenType variable font. I just got a chance to attend the type conferences lately and got inspired, so I ended up executed my Master Thesis in OpenType Variable font format.
Emotional Project Summary: The idea is to express emotion in a text message which is in between pure text and emojis usage. It mainly focuses on clarifying the sense of sarcasm or setting a tone of voice in the semi-formal situation by manipulating the default typeface in messaging app.
Technical details: It was executed in an OpenType Variable font format which interpolates between angular and cursive (line) form which caused me some errors at first. I explained the problem in detail and how I solved it on Github, also shared the files there.
Maybe it is a minor detail or an amateur "how to", but hopefully, this could be helpful to other beginners out there more or less. Please feel free to share your opinions, comments or feedback.
Note: the font is not yet completed, now only have some Glyphs