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).