Adventure Island 1 on NES is not such a good game.
The graphics are good for a title released in 1986, the handling is sometimes temperamental and the level design is poor because it is uninspired and very repetitive..
But this opus of the series unfortunately suffers from 2 big flaws:
1) It is extremely difficult (I have never beaten world 2 without savestates). Ghost 'n Goblins is easy in comparison.
2) 90% of the game is copy-pasted from Wonder Boy 1, it's a shame.
Surprisingly, the soundtrack is really cool, my favorites being Mountain Level, Cave Level, Dark Forest Level and Area Boss.
A game neither good or bad, just... meh.
Rating for the game: 55%
Score for music: 70%