I would definitely tone down burrow hopping; it's fine in big straightaways, but being able to do it in a circle to build speed makes some levels less fun. Water skipping should also be limited to 2ish bounces per jump, so you can't just skip past whole levels. Rolling could also use a buff, as there aren't very many ramps and tornado is better for walljumping, plus the drift you can do by holding S builds too little speed and drains too much stamina. Side objectives like the keys in Sandbox mode could be really good to use in normal levels, as it forces the player to actually play the level instead of skipping to the end. Overall, I think speed should be buffed in straightaways and nerfed while going in a circle, sorta in place.