More of all the fun of the first game.
If you played the first game you know what you're getting yourself into with this one. You'll have many of the same moves and fight many similar enemies and solve many puzzles throughout the adventure. This may not sound like a good thing to many people because it's nothing new, but I personally was extremely grateful they left the formula untouched because it didn't need to be changed.
The biggest addition to this game is the female character Sylvia become playable. You can switch between Joe and Sylvia at any given time, but cannot have both of them out at any time. Sylvia fights using 2 guns and has a special move in which she can do a move which will then repeat itself 3 times. Although you don't need to battle with Sylvia, and personally I didn't find her fighting all that effective, you will need to user her to solve a few puzzles throughout the game.
If you didn't play the first game, to sum up, you're in for a handful of great action, some great bosses and a whole ton of Capcom classic puzzles. Any Capcom gamer knows what I'm talking about here. The story of this game is also a continuation of the first one, sure it's not the deepest story ever, but it does have a little something going on. Personally I found it's story to be fun because it was so light-hearted and humorous.
There really isn't much to say about this game, as I said it's just more of the first game so you're feelings on that one will directly affect this one. If you want to know more about gameplay read up on the first game, but this game is definitely a blast for any Capcom action gaming fan.