Only Goes Up To Welcome Screen

[plutomaniac]

1) There should be an OK button down at the intro screens, have you seen that?
2) If it's not there at all, make sure you do a steam file integrity check as there might be corrupted files.
3) If these fail, after the problem occurs, force-close the game and attach file HPL.log as mentioned at the troubleshooting guide, Problem X (not the one is game directory but the one from Documents).