I've heard a story from a little bird that seep games were once rejected by gog, which saddens me greatly cause I want like, half of their games, with roar of revenge being the first.
It's an easy side scroll game, PERFECT and I mean PERFECT as a stepping stone to learn these kind of games, before you jump into a castlevania like and get your ass kicked. It's not very long, and it has some replayability to see all endings.