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TROUBLESHOOTING:
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*If full screen mode is stretching the image, try configuring the handling mode for "Full Screen Settings" -- Usually via the physical Settings buttons on the monitor itself.
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*If the game isn't full-screening, try pressing Alt+Enter to toggle. (An alternative is playing via windowed mode, though not recommended. Windows Magnifier could be activated to enlarge the window, via pressing [Windows Key] and [+] together. To close magnifier, press [Windows Key] and [Esc].)
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*If there is no music/sound, try pressing F1 in-game and see if BGM & BGS are checked.
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For more info, please see here: https://steamcommunity.com/app/206440/discussions/0/152391995416433989/