Check the readme, you can adjust the res options but you have to edit a file... Not sure about scaling the UI (maybe it'll scale if you embiggen the default font?).
From the readme online:
CHANGING GAME RESOLUTION:
By default, the first time the game is launched, the games internal resolution and refresh rate are set to whatever your desktop display is currently set to. We have added two ways to make adjustments to this settings.
From inside the game, go to the Main Menu, then select the Options panel. From there you can select the game to run at the following resolutions:
Desktop = (the game will run at whatever resolution your desktop is set to)
1024x768
1152x864
1280x960
If you want to run the game in a resolution and refresh rate not listed, you can manually configure these settings by editing the "display size.txt" file located in your game directory. Simply change the numbers that you see there with the width (in pixels) and height (in pixels) and refresh rate (in Hertz) you wish to run the game.
Example: For 1440x900 at 75Hz refresh rate, you would delete the numbers in that file and replace with "1440 900 75" (without quotes).
If you put in all zeroes example: 0 0 0, the game will revert to using your desktop resolution and refresh rate.
Exercise caution and only use a resolution and refresh rate supported by your monitor as damage to your monitor or display adaptor could occur, especially if you use too high a setting.