Round 2 of Octahedron should read:
K21, {sl 2 tog, k1, p2sso, k20} to last 2 sts, sl 2 tog, remove marker, k1, p2sso, replace marker.
Same adjustment for second half.

This took only 4 days, and barely any yarn at all. I could definitely make another one from my remainders, and possibly two.

Delightful pattern! I love the fact that it requires no sewing and no stuffing - the two things I like least about most knit toy patterns.