I limited the FPS in non-subpixel mode to 40, because anything above that causes the movement to be so shaky and unbearable in my opinion. I think that also makes sense as games with such resolution were always made for older hardware with even FPS as low as 10! I believe the level design is was needs to be tweaked not the jump. What do you think? I'm happy you enjoyed the game!
Level desing is fine - feels natural, at least. But add a little jump power, and it will be like a chef's kiss. ALSO! (chainsaw blades have smaller collider than a sprite - better fix that, cause that's the only major flaw i can name). And check our game as well - we are interested in getting as much feedback as we possibly can!