Thank you for your comment! Tbh we don't know why Unity made changes in the scene after building the project and it made the game confusing for the users. We're glad you got our idea even these technique difficulties :D
Yeah, you're right, we planned that the user could be able to change the skin's character, but we weren't succesful at it, even tho we leaved it on the scene because we will keep trying later in order to achieve it. We will also check that observation of getting stuck in some blocks and arriving to other levels.