That's an interesting problem! I think I know what's going on. The game was never tested for multiple screens, but it tries to guess the highest available resolution the first time you run it, and launch into fullscreen... So I think it's not understanding that you have two monitors. Unfortunately, I'm not able to patch the game any more.
But! Here's a work-around:
- Run the game at least once, Alt-F4 if you need to. (You've already done this part)
- Grab this file: https://drive.google.com/file/d/18qKajbgSdXXZS8LmQ7V0vrIc7gvGjp4M/view?usp=shari...
- And paste it here: C:\Users\YOUR_USERNAME\AppData\Local\Interactivity_v2\Saved\SaveGames\
OR if you're using the itch.io client in sandbox mode, paste it here: C:\Users\itch-player-XXXXXXXX\AppData\Local\Interactivity_v2\Saved\SaveGames\
(where c:\Users is wherever your user folders are, and XXXXXXXX is a code) - Restart the game - it should now launch in a 1280x720 window.
Let me know how it goes! :-)