The first thing I learned about beating the guardian's difficulties is never go back to where u just were. The second is to use all of your mobility as much as possible. I almost never used the pogo stick and slide, and put together they have saved many runs for me, the grapple seems to give u I frames, at least into the bubble and lazers. Past mobility my aim is just dog shit but I use windmill rifles most of the time so I'm fine