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Hi! I'm working on an open source project, and I'd like to use your pack in it (It will fit perfectly with my design). I'd like to ask if I'm allowed to to push files I'll use to github, or should I keep them only locally?

Yes, you can use them for open source projects but they can be only used inside the project and project variations.

cool! Is there anything that you want me to write in readme, about icons and copyright?