20XX Double Deluxe (the roguelite Mega Man-like) has no built-in cheat mode, cheat codes, or developer console. It is a fair-play roguelite balanced around skill and randomization.
The game has no documented debug mode accessible to players.
Use Assist Mode. It's designed by the devs (Battery Cornwall) for exactly "I want to see the content without the frustration." No external tools needed.