I got the same bug. I bought the alpha version in April, but this problem has been around since early March or maybe earlier.
This is may help you. Open up you "task manager" click on the "Processes" page. Then start Oxygen not included up. When your at the main menu Alt-Tab out of the game and enter your task manager. End anything Steam related. Go back to your game. This might keep the game from freezing so quickly.
But this doesn't help everyone. One minute in and it freezes on me. The game eats up a bunch of Memory, over 2,000MB on my computer...
Anyway, I hope this helps you and that this bug gets fixed soon.