Hi! From what I know, Kristal is an engine for deltarune battles only, so the answer is no.
I'm sure it is possible with a bit of a workaround to create an undertale-style battle, but what would be the point of doing it if CYF already does it? Besides, CYF recently got an update, version 0.6.6, which adds a lot of new things that will help me add new features to the game
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Hey there! Sorry, didn't see your reply.
Anyway, thank you very much for the help. You're right, Kristal has evolved quite a bit and there are now a bunch of new libraries like Magical Glass, though I already have abandoned CYF and have made my own engine now, so it would be really unproductive for me to restart everything from the grounds up again