Hitting the close button on the window kills the game without warning

As a user, if I click the close button on the game window, I would expect a warning before closing, so I don't accidentally close the game and lose progress since the last save.

I have tried to close dialogs in the game, and hit the window close by accident and poof the game is gone and progress is also poof and gone.

Describe the issue
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To Reproduce
Steps to reproduce the behavior:

1. Load attached save '...'
2. Do xxx '....'
3. Strange thing happens '...'

Expected behavior
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Additional context

• Game version: [e.g. 0.2.1a, see main menu]

Attachments
If applicable, add save files (zipped), screenshots, or log files to help explain the issue. You can find them in your Documents (%userprofile%/Documents/CaptainOfIndustry/). You might need to ZIP the attached files.

That's a good point, we will look into fixing this. Thanks for the report.