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In Time Warp, the background audio track that plays when warping will continue to play even if you fail the objectives early and return to the normal game. It will also continue to play if you pause the game or restart it. It seems to play for a fixed duration, regardless of what happens in the game. I don't know whether this is specific to Proton or just a general bug in the game.
A few of the videos briefly had minor stuttering/skipping.

A fantastic look through Tetris & BPS's history
This happened only once, thankfully
Runs flawlessly, including the fantastic Time Warp mode.

When activating a time warp in the Tetris Time Warp mode, the screen flashes rapidly. Various graphics appear at random, which could trigger epilepsy. Marathon modes appear to work.
Game runs smoothly. Video and audio playback work correctly. All emulators work as expected with no slowdown. However, the Tetris Time Warp game does not work in the Time Warp Score Attack mode. When attempting to trigger a time warp, the screen rapidly flashes and displays random graphics. This mode should be avoided due to potentially triggering someone's epilepsy. The marathon modes work as expected.