Thanks for the kind words on the trailer! That was draft #7; Erik and his buddy Kevin really did an awesome job. And of course Pablo's music!
And yeah, that's the Crippled Dragon miniboss type you'll start seeing around level 12. His fire breath chases you around, and blocks your shots until you destroy it, etc. He can't fly, and he just limps along the ground, but he's still easily the most dangerous miniboss in the game... so far.
We're trying to do something a little different with each enemy, rather than just going with the cliche things you see in all these sorts of games. Making the dragon crippled (and more dangerous for it) was something I thought would be pretty cool.