Really well polished game, I see a massive improvement in your work, well done!
The progression system has just the right pacing to make you feel like you're getting stronger and ready to venture into more dangerous depths without making things unfold too fast or painfully slow. I just wish it was possible to end the expedition by actually returning to the surface, instead of having to do the 30s capsule sequence even when you're practically right at the top, but it's not that much of an issue.
Keep up the good work!