npub1gztfjmu9rl25pn20a8efah94pvwgnqaerhx5h75t5rz259t0ljusnc8200 (npub1gzt…8200) some cool designs on the screenshot you sent! Is it an iOS app?
I think the non-convexity might be a problem for real life injection molded dice, although it would be fine for 3D printing.