Synthetic Love - Version 1.0

The game has a fixed resolution and is not resizable, so is unplayable at 4k unless you manually set the resolution. Create a shortcut for the .exe file (Right click the .exe and click create shortcut), right click the shortcut, and click Properties. Add a resolution parameter to the end of the Target line after the quote. It should look something like this with your install directory and preferred resolution.

"C:\...InstallDir...\Synthetic Love - Version 0.5.0\SynLove_RC050.exe" -r:3200x1800

Once you open the game wait until the menu screen loads. Once you see the menu hit Alt+Enter, it will flash and resize, then hit Alt+Enter again to get it in windowed mode. You can now move the window and center it.