Neat game you got! Reminds me of those rage games from back in the day. I am not very good at platformers and struggled a lot in the later levels. Had to give it a break, may need to come back to it later to finish.
I think my only bit of feedback would be on the visuals. The lava and font kind of feel disconnected with the rest of the assets you have. With the lava, you have these minimalist solid colored visuals that are being paired with what appears to be a texture. Something about it feels off. I think a solid color might look better for me personally. Also, the font is very bubbly. I'd almost expect to see something more rigid like a simple sans serif to match the minimalist-esque vibe you got going on.
Also, I'm not too keen on the color choice for everything. Would be cool to see the implementation of a very small palette of some sort, just so everything compliments each other. The character reminds me of those yellow pedestrian walking signs. so maybe yellowish orange and black might look neat.
Honestly, these are mainly just nitpicks. It's good stuff regardless!
- S.