Hello, I've been playing the game a total of 6 hours and I find it fun to play and very promising. Since it have a lot of potential to grow in complexity and fun of course! My suggestion is to create a research topic about exploration, things like oxygen masks or better digging machinery would be useful.
In general I feel like the game is challenging, but i think it is now capped at the amount of water that is available. Also a use to chlorine and other materials would be cool, so the exploration has more meaning and purpose.