On loading, the intro runs fine, but on the start/load/resume screen the mouse cursor vanishes. I managed to get into the game by hitting enter at the right time when start was highlighted but now there's no cursor in the game at all, the 2 characters run to the left of the screen and are uncontrollable.

I have no other controllers/peripherals plugged in (as I know this can affect this game) and I have no idea what to do. Any ideas?

Same here tried replugging in the keyboard, it seems like a controller problem. Any word on a fix?

Nothing yet, some guy posted a save file to download on another forum (I think it was the developers', I forget) that disables keyboard input, but it didn't work for me. Might be worth a try for you tho. Seems a lot of people have the same problem on Win7