Lobby: Laser plants covering the walls and forming barriers, some of which only activate when the player would get hit (keep some hints as to where they are)
Storage room: A floor covered in an instant KO layer of liquid, with props on it for the player to stand on, some of which break when stood on.
Experiment room: Sentries (plant skin) cover placed on the floor, with high damage, accuracy, and speed, with platforms above them (vines), that the player has to cross, while avoiding fire from the sentries. Also maybe add pipes leaking G R E E N J U I C E like the stuff on the previous room’s floor, that instantly KOs players, which periodically stops, allowing the player to pass. Also maybe give the player a few bits of dynamic dirt they have to use to either cross gaps or block the sentries. Make this room more vertical.
Decontamination chamber: The player is locked into a room, in which they have to avoid a large number of threats (not sure yet what it should be, maybe more sentries and/or more lasers). After some time has passed, the exit door opens to the finish.