I love that you have a README and License file (main criteria for open source category). Well complete and structured README. Nice job.
The "Play" and text buttons on the home screen are super hard to use. It's thin white on light grey textured. Game is slightly glitchy with the movement, hard to run around and sometimes gets stuck in the "jump" action. I feel like getting in the fire should almost be instant death if you can't jump out... I was just watching my character slowly die in the fire... was sad, except that I didn't actually die. The health bar was depleted and red "5"s were coming out of the character, but still wasn't dying. Kinda good, but then had to restart the game rather than watch him burn but die 😅.
Graphics are good, Sound effects are great. Add some music to make this a little more immersive, and take some time to focus on getting the movement and controls of the character really good. You can start with the first level being a little easier too so the player gets the hang of controls and can understand the physics before continuing.
Good solid base for your game. Nice work.