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At the top of the main menu there's a toggle between classic and sandbox, but the game store lists story and random modes as well. It says sandbox can be turned on or off, which I assume is that toggle I spotted. I'm not sure how to choose between story and random though.
Explore the game in different game modes: in story mode (5-10 minutes), in random mode (15-20 minutes – the level looks and develops differently every time you launch) or in sandbox-like regime (can be turned on for both story and random modes. It allows to play without time and money limits).
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Aha, found my answer:
https://steamcommunity.com/app/353640/discussions/0/1291816880499370453/