Hi EverfreeOutpost,
Thank you for reaching out! Yes, all my paid and free asset packs are licensed under CC0. This means that once you've purchased and downloaded the pack, you are free to use, modify, and redistribute the files without restriction, including within open-source projects.
I appreciate you clarifying, and I’m glad to hear you’re interested in using the assets in an open-source game—sounds like a great project! If you have any further questions or need clarification, feel free to let me know.
Best of luck with your game development!