I must confess that I like the Metal Gear music!
There's one mantis at the top ofa ramp in the first Metal Gear zone that is there just to make you lose rings, I know now to aim left and hit the spring board but it is very annoying!
I am happy with this game, overall I think it is a bit overpriced but it is fun and cashes in heavily on nostalgia.
I do think they played it a bit too safe though, the levels are very similar in look to Sonic 1 and 2, the badniks are all reused and the bosses are just lazy.
I also think the game gives away too many 1ups, I get about 3 per level sometimes.