
I played the first episode on version 1.3D (I believe, since it doesn't have the fourth episode), and things ran pretty swimmingly. But I did have problems with the ending cutscene, which lacked the ingame music.
But a bigger problem was, when I decided to fire up the second episode immediately after having finished the first episode: When I finished the first level of episode 2, the game immediately jumped to the ending cutscene of episode 2, and then the game brought me back to the main menu!
I tested it again by now starting up episode 1 again and finishing the first level, and the same happened, except this time I was brought to the episode 1 ending cutscene.