Originally designed as a pixel font, this font includes light and dense fill variants, each with a corresponding pixelated shadow, that contrast one another in form (and potentially in color as well).
A–Z capitals and 1–0 numerals are supported along with basic punctuation. Lowercase letters are unsupported to keep file size small. The fills weigh in under 10kb in woff2 format, while the shadows weigh under 5kb, keeping the burden on webpages minimal.
Tilastia can be downloaded for free here.