Sorry you're having issues! That's a weird one - however that world does change a lot during it and I do believe there is a portion of the level that looks like the first level.
However, we do have a secret hidden in the game that may help you. To make up for the trouble, I'll post it here although I will warn this is from memory (I'll confirm later on): hold the letters 'D' and 'J' at the main menu screen for a level select screen ;)