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I have retested with new version. Oxygen is fixed. GREAT! :) Now I know that I live. ;)

About upgrade issues: when you close the window you can't use upgraded things AND you can't upgrade them more. Just expand your inventory, save, close the window, open the game again and *magic* you can't use expanded inventory again (only 25 resources instead of 30-something).

Wow,  I never noticed the upgrade bug,thanks for finding out. My results however are a little different. The only upgrade that didn't get saved was the player inventory upgrade, can you confirm that? Other upgrades seem to load fine.