Single Comment

I like this game. I'd make just a minor change, but I can't understand if
you don't because, even if minor, it would be a major pain to redo all
the diagrams.

It's a shame you overlooked that tiny detail, but it would have been nice
if Canary and Robin swapped their movement capabilities (and the major
birds swapped accordingly). That would be so you had a Red Robin making
Rook-like movements, just as you have a Blue Bluejay making Bishop-like
movements, making it even easier to learn for chess players.

Another problem of this game is that it can't easily be translated into
other languages, but that's not definitely your fault.

That being told, I want to insist this game looks really interesting and
nice, in spite of my post making it seem otherwise. Just pointing minor
flaws, good job!