This font corresponds to an extended Latin font. Each character is loosley based on what sound it represents. Each letter comprises of a vertical stem with additions at the top, middle, and bottom, before or after the stem, depending on the use of lips, tongue, breath, and voice.
The numerical system is based on a horizontal bar. The marks on the bar behave like a 4-bit binary system to represent 0-9.
The punctuation is based on the character that represents the period.
A font in which Japanese or half-width alphanumeric characters are written in 15 × 15 pixels.
15×15のピクセルで文字を書いたフォントです。
Postscript: The version made with fontforge has been released.
You can use more kanji here, and you can also write vertically.
追記:fontforgeで製作したバージョンを公開しました。
こちらでは漢字をより多く使えますし、縦書きもできます。
https://mikannnoki-font.booth.pm/items/1488587