To help with reviewing this game during Game-Like Jam 9, here are the 'cheat' codes required to access levels 2-7:

Level 2: UQY

Level 3: VFD

Level 4: GPO

Level 5: OLZ

Level 6: XZR

Level 7: BRX

To use these, select option 3 from the main game menu, then type the three letters (case insensitive).