found that you can shove yourself through walls by placing nitro/rocket boosters/planks* on top of yourself and getting yourself stuck. Don't think it's going to be useful because walls don't really matter in this game, but thought you should know.
*I couldn't do it with just planks, but they can help get you stuck in the right place before you use boosters to get through
the only issue i can really think of is getting that many items to stack under you. not sure if booster or nitro are unlocked by then in full game but that's definitely a time save for individual level runs. Good Work :)
In theory it should be possible with planks, because they also displace you the same way nitro/bombs/ and boosters do. Maybe someone who is better at the game than me can find a way