I wouldn't say its short, probabably average. You can finishe the game very quickly, but if you ant to get 100% at the end of it there is quite a bit you have to do. There is quite a bit to go after you find princess Leia.
I played so many incarnations of this game Gameboy was easiest (Still hard) and also the first version i played. Nes Game was Middle because it had more animations and faster graphics than the Gameboy version, The Sms version had the best graphics of the bunch but was also the hardest because it had better graphics meaning higher animations for things like acid and gameplay was faster