Really cool concept. There should be some kind of timer to keep track of how long the player has survived. I think that would tie together nicely with the gameplay of trying to survive as long as possible.
Viewing post in Feed Your Dragons jam comments
Actually there is an end to the game. You need to get full hearts to all dragons to win the game.
This was pointed in the picture that shows full hearts and a text success.
We were thinking also somekind of point system but not enough time to think what kind of so we sticked to only to get full hearts to win.