Hey, thank you for trying out the game! Good to know that the dev version with huge initial resources has snuck into the linux build ;)
Saving and loading is very high on our priority list and will be implemented before new gameplay features.
Subtitles will surely be in the game at some point, but they are not very high on the priority list. The player should be able to understand what to do from just the mission text in the top right ideally.
We are working on fixing the worst offending bugs and balancing issues at the moment and will release an update soon which will hopefully make the current experience smoother.