A very unique ability indeed! So much so that I found it impossible to complete the first objective. It's a bit beyond me, I think. The mechanic is challenging and exciting, although a bit difficult. 

Good job! Although I'd suggest adding a menu to let your player exit the game. I had to ctrl-alt-del and then use the task manager to close it. 

Well, it's a bit jank when sometimes you change gravity to be sideways and you stay "sticking" to the wall, btu I can definitely see the potential for a good puzzle game here. Only thing I'd change is if you will only allow gravity changes on the ground, then make the physics a bit more deterministic, i.e. slow down the player horizontally when falling up/down (or vertically when falling left/right), I feel like the way it's currently done could make some sections annoying, if you want to fall striahg down but overshoot it and fail. This could definitely be also turned into a rage game if you allow graivty changes in mid-air. Cool beans.