New bug report: The deflectors don't actually block Spore Spires, but they look like they do in the highlight preview. And I'd been excited to see the deflectors actually being useful, too...
Thanks for reporting. Deflectors don't block spread, they're "bad" tiles that split adjacent similar tiles into separate groups, increasing the challenge of the group-selection mechanic. In the new version, I changed the art of Deflectors to better communicate that.