You have a README which is great (add a little more into the doc, such as screenshots to spice it up). I can see you also have a License, but it's been renamed to "COPYING" so it doesn't look like the License file; maybe change the name back to License to make this more obvious (I can see from the GitHub side bar that the project using <a href="https://github.com/jo-ho/tilt-up#GPL-3.0-1-ov-file" class="Link--muted" data-analytics-event="{" category":"repository="" overview","action":"click","label":"location:sidebar;file:license"}"="">GPL-3.0 license</a>). (README and License are two main criteria for open source category).
Different take on balance. The music is soooo epic! I like the sound effects too. Physics works pretty well, and creative thoughts on the theme. Nice work.