Extra Modes and Secrets? (Patreon)

Since Zap and Andy is a throwback to games from the early 90s, I wanna include cheat codes beyond passwords to skip to specific levels. Like games from that era, I wanna have some silly stuff. An idea I had is to reward the player for getting the high score on Pact Man by giving them a password they can use on the title screen. When you put that password in you get a short (can be beaten in like 10 minutes) 80s adventure game like Zap and Andy was a series started back then. What do you guys think?