I've no idea on how to use the behavior, but I want it to look like Undertales Blue Soul jump.
I'm creating an Undertale engine with 8-direction and platform. I don't know how to make it jump faster while you're pressing UP though.
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I get immersion that analog jump is what you are after. If that the case followng platformer-proto should in your check list: dropbox.com/s/a5bzym3aex89j70/platform_slope.capx