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I'm learning Heaps.io working on Deepnight's gamebase and Pixel Frog's Pixel Adventure to recreate a puzzle game very much similar to the demo in his Itch page.
Can I submit it or it's too derivative?

I think if you make all that clear then there's no issue. It's fine to use this jam as a learning experience. The rules are some of the most relaxed around,  to help people at all different levels and stages in their process