This game was super cool! Unfortunately at about 20km deep I died and in the white/green space where you can see the "godparent" I pressed escape and the game closed :(.
The oxygen/CO2 mechanic is pretty fun once you get used to how it works. Setting each one just right to try to offset one another made me feel smart, and the fire/hull breaches kept it interesting. The bestiary component with the journal and seeing creatures out the window was awesome, and once I got into the vibe/feeling of the game it was nice to read the history as it developed.
The probe camera effect was cool but I kind of wished I could go see the creatures up close with the same fidelity I could see out of the window.
All told I was just really impressed with the concept and everything you managed to get done in the time period. Awesome job!