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Sources & notes

1. This game's state engine, checked directly: in survival mode it multiplies the tilt gravity by 1.5, a change its own comment calls fifty percent more aggressive tilt physics. The same engine switches off the consecutive-clear tempo bonus in this mode.
2. “Ship stability,” Wikipedia, the study of how a vessel behaves when displaced from upright, and whether the forces acting on it return it to level or carry it further over. en.wikipedia.org/wiki/Ship_stability.
3. This game's main loop, checked directly: it tracks the peak tilt reached and the elapsed time, and the end-of-run panel reports those two alongside lines cleared and level reached, with no score.
4. This game's configuration, checked directly: Heavy Seas runs the survival mode and starts the hull with no initial list.