Came from your challenge thread, so I'll leave a longer more detailed review than normal~
You could fix your volume sliders to use the entirety of the slider bar by accounting for the logarithmic nature of the actual volume value (do a conversion: Mathf.Log10(sliderValue)).
Controls are very slippery, especially on the uneven terrain, and the jump height rather inconsistant. It took a little while to get used to.
The art style is unique, and gives the whole thing a hand-made feel - but I recommend looking into other art workflows for a more generally appealing visual style - next time, try hand painting and shading everything in Krita, using tricks like attempting to duplicate color and lighting effects from chosen reference material, and lots of smoothing and blending!
I could not figure out what to do for level 4. level 3 was also very unclear until I eventually missed a jump and fell, "completing" it. Overall, instructions are pretty unclear - which I guess is fine if your goal was a puzzle game.