The game is really good! Somee suggestions:
- Maybe displaying current score somewhere on the screen, that would make it easier to understand how to get max points
- A main menu with selecting difficulty levels(that should change field size and dragon hp)
- Ability to spend gold( i guess it's XP) to not only buy character upgrades, but maybe buying some ability or something like that
The new update if fire and the game has great potential, keep up the good work!