To be honest, winning a game with just one glitch is just lame. For sure you have to acquire a certain amount of skill to perform it smoothly, but there isn't more than that.

its easy to see that the gravity is far lower than in the normal game. (for example at hat jump, bucket jump, and obviously right at the beginning when he jumps over the tree)

Allowing all of these mods would require a proper tutorial in the "Guides" section, for idiots like me ^^