The blue drakes are probably the first target you should chase down before focusing any of the other drakes, they can be frustrating to deal with.
I'm glad to hear you like the premise of the game. I like it myself and I'd love to push out a new game that has the same basic idea.
That being said, I'm currently working on something new, which I hope will turn out a bit better since it's not a project I need to crack into shape within a strict time limit. Though I can't say when I'll have something decent enough put together for itch.