Thanks for the feedback. I totally agree with the sprite size thing--I made the dragon first thing and realized it was too small for the resolution I wanted to make, and then just doubled the size...that's one of the first polish things i plan to implement over the next month or so, in addition to replacing the music and some sfx (the music was some I wrote intended for a different game, I feel like a more retro, simpler style might work better?)
I'm not sure how I could implement screenshake but I think that sounds like a cool idea as well. Do you mean like when the player dies/gets hit?