Added it! Thanks for the feedback; now you can press [R] while in the pause menu to restart the song! Also, I fixed the bug with the frozen screen on death. It was a bug with the Unity software.
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At first, I didn't split my songs into inst and vocals files for the first stage and the first two seconds in the second stage. I only have them for the last song in the second stage and the other full stages. If you want the resources, you can join the Discord server and I'd be happy to supply you with them!