Moving scenery around is a breeze, you can just drag it.
Increase or decrease the size of a pipe using only the stylus.
The sort of level I’d make. A pile of Goombas.
You can also make New Super Mario Bros U levels if the original Super Mario Bros is a bit too “old” for you
An intricate maze of a Super Mario Bros level, however will Mario bypass that “inpassable” pile of Piranha’s?
The New Super Mario Bros U version of the SMB screenshot above.
Good luck.