Looks amazing, and has a great soundtrack too. Still, it's quite easy to complete.
But, nice to see that after you beat the 10 bosses, more are unlocked as a sort of hidden challenge.
Wish the game had more of those. Also, I like what you did with the green crystals, but after I've unlocked some wings and characters, there's not much use of them. Dunno if certain wings or characters had a special bonus or something. Would be cool if you add more usage to them. But this is a pretty good idler. Just not as challenging.