overall very fun! on my first playthrough I got steam rolled by the first fight! but on the second play through once I understood more of the dragons abilities I beat the first fight only to get steamrolled again by the second fight! on my third play though I easily beat the first fight and managed to win the second fight as I got better at positioning my dragons to avoid the enemy dragons being able to hit multiple of my dragons and better planning on the board but once again I got steam rolled by the third fight! continuing to try several more times I still haven't managed to beat the king! I enjoy the decision making aspect of deciding if I scale up one dragon to take up more of the board and be harder to kill or spread out my dragons to overwhelm the board!
I think you have a very unique idea and enjoyed playing, however my note of feedback would be on maybe having another mechanic on how you get energy for the player similar to the sparkle dragon the ai gets. having my energy coming just from controlling more of the board feels very "win more", if I'm doing well I don't really need more energy and if I'm doing poorly there is no chance I can make a come back even with clever play.