I just got a 7.720 on level 3 by landing right on top of the first 4 armed spinny thing and shooting across the rest of the map, can't recreate it reliably yet though.
On level 4, If you jump right into the bottom of the large physics applied square, then you'll pop straight up, if you hold right and don't jump you'll bounce off the far end of the hole and get to the finish, very reliably gets me around 14 second times.
In the minecart level, I theorize that one could corner bounce off the back of the first minecart right as it falls, then roll forwards off the front lip of the second one, skipping the travel time of the second minecart.
That's all I've found for now, rest use either your WR strat or no strat
On "Box Roll" you can do a zero roll with precise timing. I've gotten it a few times, I'll get back to you once I'm more consistent. P.S. Could you explain your WR route for "Go Right?"? I'm struggling to understand what you're doing there.
Sokoban can be made much easier with a trick similar to box roll, where moving on top of the boxes causes them to rotate, combined with the fact that the boxes clip slightly into the floor. you can roll onto the first one by holding right without jumping, jump off it, and then jump off the next two boxes in the right fashion to beat the level.
i think the strat for go right? is fairly well known but i will share anyway. just hold d the entire run, start by jumping as soon as you hit the ground, then dont jump when you land next, then hold space and you will go flying above the large box, and you can get it in 10.1xx i think (im too lazy to check)
