The artstyle: I'm not a fan of Steampunk in general, I personally prefer futuristic tech, but the art style of S.T.E.A.M is still quite nice for the 3DS. I've been replaying Dragon Quest IX recently and the character models remind me of the 3D models in DQ IX, simplistic but detailed.
The intro cutscene (of the presentation): in true comic book style, its cheesy, its over the top, its funny. Thats all that I can really say on the matter.
Gameplay: The gameplay looks like its going to take some time for fans of turn based games to get used to as there are a lot of differences. The camera is always behind the characters (same as third person shooters), the mobility of the characters is dependent on the amount of steam they have in their tanks, the ability to attack is also affect by the amount of steam so the player will have to balance mobility and attacks. The party of 4 characters seam to have multiple weapons and abilities that they can use during the battle and the power of the attacks can also be edited so that weaker shots use less steam. Height seems to be a core part of gameplay, so that you can no whats happening on the battlefield. Control seems to be touch screen heavy and I didn't see any button controls used in the presentation.
Soundtrack: I couldn't tell what was S.T.E.A.M and what was other games at E3, so i'm not going to say anything about the audio for now.
That's pretty much it for Code Name S.T.E.A.M. Feel free to watch the video for more info on the game if your curious. I'll loo into it some more closer to its release and I'll probably give it a review. Tommorow, the reason why I didn't say much on Far Cry 4.