Awesome game ! And funny thing, we had a very similar idea (ours is an ice wizard fighting a fire wizard) but ended un with a really different game !
Yours feels really great to play and has awesome visuals, really impressive work for a first game jam, congratulations on this !
On what to improve, I'd say the health an energy bars don't seem as important as they are. I didn't even know there was energy the first time I played. The second time though... it feels really nice trying moving the dragons the right way while also keeping an eye on the energy and health bars !
So the only thing I would change is maybe put the hud at the bottom and/or top of the screen, rather than in the top right corner.
But other than that, really cool arcade game ! These were 48 hours well spent :D