Awesome game but the menu theme is pretty similar to the menu theme from Iris and the Giant. I'm not sure if it's just a nod to that game but they're almost identical.
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It's from a popular royalty-free music pack so I'm sure many devs have used it: https://assetstore.unity.com/packages/audio/music/orchestral/ultimate-game-music-collection-37351. Supraland also used this soundtrack: