I was able to get into the cave in version 0.7.4. I did find a few other bugs, though:
Elevators don’t seem to like it when you try to build more platforms on top of Hab Walls next to them. Sometimes, adding another platform causes the elevator to lose its connection with the current highest level. The elevator also tends to flicker while you’re venting energy to build said platform.
Also, this one might be my fault for building platforms on top of an elevator, but sometimes, if you’re holding down on the elevator as it tries to pass through a level with overlapped platforms, your character will teleport upward and then fall through the elevator and platforms all the way to the ground.
(If you’re wondering why I built platforms on top of an elevator in the first place, it’s because I wanted to build a reactor-less power setup for a teleporter hub right outside the cave. The building process was a bit awkward, but I managed to make it work in the end.)
On the subject of teleporter hubs, as I think someone mentioned earlier, if you build a hub on the surface before going through the subterranean area, the game will still nag you about finding your crewmates as if you’re in the subterranean area. It can be a bit annoying, since the line interferes with your ability to check on the status of the hub, although the hub itself is still functional.
Oh, and one more thing about elevators: It’s possible for a character to go up a weight stage while riding the elevator. One time, this happened to me while I was right at the edge of the elevator, next to the wall, and I ended up getting stuck in place until I vented some energy to slim down again. I forgot to take a screenshot, though, and most of the time, it seems like you’ll just get pushed away from the wall if you grow while close to it.
Maybe not a bug, per se, but if you load a save in the cave, you can catch a glimpse of the game removing the replacement floor if you haven’t gotten to that point yet.
The game has a tendency to crash when I try to talk to other crew members. Unfortunately, I haven’t been able to figure out what causes it, but I did take a screenshot of the error message.
Some of the voices and text colors are still mixed up in one of the conversations between Dax and the Captain.
And finally, if you load a save in the middle of a cutscene or conversation, the game doesn’t return control of your character to you, so you won’t be able to move or do anything. Fortunately, you can fix this by exiting to the main menu and then loading the save again.
All right, I think that’s all I’ve noticed for now… I still have yet to actually play through the underground section again on this save file. The game is still a lot of fun, by the way, despite the bugs. I may have spent a bit more time optimizing my setups than I really needed to…
Oh, and one quick question: Is there any gameplay difference between Tauma and Dax? Obviously, the Captain is bigger and faster, but I couldn’t tell if there was any reason to switch between the other two. (Or, for that matter, to use them instead of the Captain… She can actually hit the weight threshold to break the floor by herself!)