Love this game, played over a 100 hours on it.
I would like to suggest a pause button, a feature to pour liquid on the ground (like soap) instead of drain (which is still necessary), the ability to grab ledges with empty hands (with the chance for hand damage if you're falling too fast), and the ability to find corpses from failed runs with everything heavily drained/damaged/spoiled.
My main gripe is how much water can sweep you away even if it's a small amount, and while i understand the sawians have higher bone and muscle density leading to them sinking faster, it feels awkward being ragdolled by less than 400ml of water moving past your ankles.