Tips for my 2D Game.

I have finished my 2D game, Can you give some advice for improve it?
https://play.google.com/store/apps/details?id=com.Giovincello.gioco

 

Animated title screen- this could be anything from clouds to the fire you already have in the game.

Have the layered grass areas be walkable or remove them. Behind your brown rocks you need to add a sprite or plane that colormatches, I had parts that were showing the sky. There are also rocks that are misaligned.

Gameplay is very simple and could use some power ups or a special ability of some kind. The dragons don't turn around if you are behind them and stopped attacking if they see that they hit you.

Ads...... Holy god..... I don't mind an ad after a level or two, but every single death.... Trying to test the game was a pain because I wanted to see how all of the mechanics worked and to do this I had to die.

Overall, good gameplay, simple, entertaining, graphically nice and just some simple changes are needed.

 

Thanks for this advice, I will try to fix those things.
This is my first game so I try to make a simple one.