The alarm siren combined with the collapsing floor platforms is a really smart way to build tension — ZodiacSauce nailed it when they said it kept them on their toes, and that sense of urgency is exactly what a submarine escape game needs. The movement feeling smooth (as failed67 noticed) is a solid foundation to build on too. The contrast issue that both redkoala64 and Ogma Games flagged is definitely worth addressing post-jam — making the platforms stand out more from the background would make the whole experience much less frustrating, especially when the timer is ticking. Pulling the camera out just a touch, as Void Hat Games suggested, would also give players a bit more breathing room to spot pits and plan their route under pressure. Feel free to check out my sky platformer too if you get a moment!