I added a new update:
Added new difficulty levels, available from the Options menu or before starting the game (later an option will appear to disable the pre-game window).
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New upgrades, e.g., faster XP gain.
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Slightly adjusted level balance.
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Added separate leaderboards for each difficulty level.
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Updated localization (around 200 translations).
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Other minor bug fixes.
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Updated the browser version (Chrome, Firefox, MS-Edge).