More relevantly: I've spent way too long rolling my own issue tracking systems (plural!) over the years, and it's good to see someone else share my intuition that dependencies and tagging are by far the most important part of solo-ish issue trackers. You'd be shocked how many massive tech companies publish issue trackers where dependencies are an afterthought (or worse: a paid upgrade).
My only tiny, soft suggestion would be mention "Unix Philosophy" rather than just the MVP link, tho it is indeed cute. As I alluded to above, the former has a dedicated cult behind it already ;)
And I may just go make a README tweak re: unix philosophy... The MVP story floated up from the back of my mind when I went to go build this but you're totally right.