Hi,

On some computers, you can experience a resolution issue orsome problem with mouse controls.
To fix fix, please try the following:
1. Right-click the game in your Steam Library and select Properties
2. Look under the Local files tab for a button labelled "Browse local files..."
3. Right click Alchemist.exe > Properties > Compatibility and check "Disable display scaling on high DPI" settings and apply now

Or,
1. While in-game, press F11 to change from Fullscreen to Windowed Fullscreen or to Windowed mode.

Thanks.