Just found a new glitch, which in the future may be more useful than it is.

1. Go to 3-1(Sugure Rush level 1)
2. After the repeated columns with bugs, you need to go before to slanted slopes.
3. As Felix, hold right until you stop mostly inside the wall.
4. Switch character 8 times(Sometimes is 6 if your positioned pixel perfect)
5. Fall through the floor
6. (Optional) You can hold right after clipping and end up in the blocks able to move around until an invisible wall stops you.