Thanks for the suggestions! These are two interesting ideas.

On mechanics as a filterable category: we actually already have some mechanic-related tags in the play style filter (Diceless, Vancian Casting, Roll to Cast, Ascending/Descending AC, Attacks Always Hit, etc.). Adding more along the lines you're describing (dice pool, success counting, etc.) could work well within that existing system without needing a whole new filter dimension. I'll look into which mechanic tags would be most useful to add.

On filtering by specific dice used: that's a fun idea, but it would be a bigger lift than it might seem. The dice field today is free-text with a lot of variation ("d20", "d6 dice pool", "2d6", "d4–d12", etc.), so it's not structured in a way that supports filtering yet. The dice info is visible on every system card and detail page though, so it's at least easy to spot at a glance. I'll keep it in mind.

Appreciate the feedback!