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Another user (on GOG) ran into a similar problem. A contributor on the Transolar Games Discord server found that it's likely caused by a system locale/region mismatch. Are you in a country that uses comma (0,25) to indicate a decimal number? The U.S. uses a period (0.25), and that can break the code. Our contributor suggested using Lutris to change the locale:

1. Open Lutris
2. Right-click on Summer Daze: Tilly's Tale
3. Select Configure
4. Go to the System options tab
5. Scroll down to the Environment variables section
6. Click the Add button:
   1. Key: LC_ALL
   2. Value: C
7. Click Save
8. Relaunch the game.

The "C" option causes the system to use standard English/Computer formatting for numbers.

Also please note that we have recently uploaded updated versions of Summer Daze: Tilly's Tale for all systems. This might fix your issue without having to change locale settings.