(I'm back) In order for lv 21 and above to be of some use, I decided to add "Upgrade Cards". This will allow you to choose what you want to improve, but each card has a limit (that's the downside). They will only appear when you raise lv 21 and above.

Don't

Underworld Frisk

Underfell Sans

Battle system (This is how the battle system might look like)

New menu (test)

I decided to update the design a little: warp zone (But this may change)

Core Frisk

Underfell Sans at the battle

Cuphead