In https://github.com/s-a/digital-numbers-font/blob/gh-pages/build/script.pe you need to correct directions and remove overlaps, or this happens:

I suggest using python to make a build.py like this (written into the issue without testing :)

import fontforge
font = fontforge.open("../src/digital-numbers.sfd")
for glyph in font.glyphs():
    glyph.round()
    glyph.correctDirection()
    glyph.removeOverlap()
    glyph.addExtrema()
    glyph.simplify()
formats = ['sa-digital-number.ttf', 'sa-digital-number.svg', 'sa-digital-number.woff', 'sa-digital-number.eot']
for file in formats:
    font.generate(file, flags=("round", "dummy-dsig"))

• the final binary has an FFTM table, which can be removed with fontTools but sadly it seems FontForge doesn't have an option to prevent it being included (fontforge/fontforge#2389)
• the name table includes items with PlatformID="1" but these can be removed with fontTools
• the name table version string (item 5) had a trailing space
• the canonical filename of the font should be DigitalNumbers-Regular.ttf

I fixed these things in the version I committed to google/fonts@e860dd8 - please use this in the dist/ directory, and cut a release on https://github.com/s-a/digital-numbers-font/releases :)

The Basic Latin is ~200 glyphs listed in github.com/google/fonts/tools/encodings/latin_unique-glyphs.nam

3 licenses are mentioned in the README, but no actual licensing file is included; I suggest including the SIL Open Font License v1.1 with no Reserved Font Name as an OFL.txt

Source files are defined as the preferred form of modification, plus reproducible build instructions or scripts.

While some SVGs are included in the /src directory, its not clear how to build a TTF from them :)