Starting off, the overall atmosphere of the game in terms of visuals is incredible 5/5 for that. This could have been further on reinforced with some slick sound effects and soundtrack. The resolution for my computer was a bit off so I couldn't really read the menu/pause menu properly. The jumping was a lil bit frustrating at times, this definitely needs revising. The speed of the character whilst sprinting was a bit too exaggerated as well. Also, I was really confused of a certain level where some fire balls would not stop following me.
Some good points:
The visuals (shader I assuume) are on point and I would say don't restrict yourself with simple platformer if you plan to continue working on the game, as I do think it has potential. I loved the subtle environment integrated checkpoint system. Overall I think the game for only a few weeks of works is incredible for what it is and what is trying to achieve with a few nitpicky features such as the jumping mainly which was not as 'controllable' and reliable as I personally hoped/wished and wanted more challenge whilst playing. I hope you continue with it.