System requirements
The exact specifications are below but if you're not a technophile and don't understand them don't worry. The game is completely free so simply download it, install it, and then try it. If it doesn't work, you haven't lost anything!

Can I use a joypad or joystick instead of the keys?
Yes, Move My Castle supports most Direct X compatible joypads and joysticks.

I like 2D games but the resolutions make it hard to see in a window
Unlike many 2D games the resolution on Move My Castle is scalable and so all of the standard resolutions between 800x600 and 1600x1200 are available so long as your monitor supports them.

I've set the resolution to one my monitor can't display, how do I fix this now?
Move My Castle checks which resolutions are available with the current monitor so this shouldn't happen but sometimes monitors can lie. There's no need to reinstall the game to get this working again. Simply go to:

<Install-directory>\Move My Castle\Miscellaneous\

which by default is:

C:\Program Files\Move My Castle\Miscellaneous\

and delete the file called 'Settings', this will reset the resolution to 800x600 while keeping all of your high scores and other data intact.