Hm, made this in under 5 hours. It helped that I still had Amiton's abjad template from 2016.

So, an idea I had in 2015 but never got around putting in practice. In 2016 I actually ended up making a polished version of Unamireu (itself a polished version of Amireu from 2013), Amiton, and then I spent all this time using Amiton and Amireu almost exclusively. However, reading is difficult when making the font small, hence my desire to create Amisima since 2015. And here we are.