I regret not posting it before Canvas 2025, but hopefully it'll be useful for people playing it in 2026. All letters are 5 pixels tall, and most 3 pixels wide (some 4, a few 5). I've also included a few Cyrillic letters and the digits.
I tried to make it even smaller, but it gets really funky.
Do you have some good examples of that? The more, the merrier - it might help people to get ideas.
There's hundreds, here's a few tiny ones:
Example of discussion on the topic:
This is amazing - thank you!
That's a great list, thank you! I love small fonts.