The game only has a few issues at the moment (as of 0.12), but it's a really good demo. First, leaving any cave takes you to planet zero. Second, learning a skill creates an error, thus you can't learn skills aside from leveling. Third, (not really a bug) using a save editor to edit a file (to test skills and such as they're unattainable), renders the file unloadable. Hope this helps the game progress, keep up the good work!