I'm back to work after taking a short break. The levels are a race against time until you can get a support station. After that, it is much more resource management. The later drillers are quite powerful and you need to create the infrastructure to support them or your calc slows WAY down. You probably won't be losing a lot of levels. (the first couple are impossible to lose) It is more focused on planning and building. I have created all but the last level by now. I would like to add a random map generator, but that seems unlikely to happen due to space problems.
I am patching up the last couple bugs with the end levels. Levels 1-11 are completely stable (I have completed them 6+ times each without any bugs)
The big problem is that past level 11 some maps are bigger than 32x32 tiles (256 pixels) so I have to patch some really weird visual bugs.
Another beta release within the week!