It is great for mobile devices, one of those time-killers, when you find yourself restarting the game over and over again.
When I first started the game a was trying to avoid the fire, maybe it instinctively reminded me of the Bowser fire from Super Mario Bros. Going on after some time jumping and avoiding the fire I was not sure why I had an attack action available and why my score was not going up. Then I went back to game description and saw an attached GIF to find out that you are supposed to attack the fire! Maybe I am just dumb :-)
I was playing on desktop and it would be great if "Restart" button can be initiated via keyboard, maybe by pressing on a jump or attack button (or both), because I had to reach over my mouse to press restart every time I died.
Not sure if it the final version or if you are going to improve it, but I think if you add some nice scenery on the background and decorate the ground blocks, plus some light music, it will be much more enjoyable to play. The overall gameplay is great and I don't think you need to add anything else. Good job!