I played a bit and wrote down some thoughts. Generally, the burning is satisfying and it will be the main reason why people play it in my opinion. You could add skillshots or something like that or different animations when the fire is bigger so you would have a combo maybe. Keep going good job!
Here my thoughts:
Menu
- Continue button makes no sense if I have never played the game
- I can see the background button image in the menu. I assume you do not want it to be visible
Game
- I would make the intro skippable. Many people would just stop playing because it takes a long time
- I tried clicking with my mouse on the level because there is no feedback on the controls
- I would like it if the is a collision animation if you dash into something or destroy it because it broke
- I did not understand at first that the goal is to burn as much as possible until you reach 100%. Add something for that to the tutorial
- say over the checkpoint that it is a checkpoint or something like that. I was not aware of what it does until I died
- The game crashed when I wanted to finish level 2
- Maybe show somehow when the dash is available again