I made Subjective Gravity as a version of spider climb.

Have you checked the proposal against Spell Design?

I have removed the material components it should be correct now.

Looks good to me

I could see a version where you do not need to have your hands free, at the cost of being "Target: Self". What do you think about that?

It would be a stronger buff, but only to your own gravity (you already have levitate to boost others, so it wouldn't hinder your kit that much).