Fighting is equally intuitive: hold your hand up towards whatever it is you want vaporized and press the thumb trigger to fire the repulsor beam. Each hand is armed and, thankfully, the suit automatically hovers while you're engaging enemies. There's a punch mechanic as well, which is great for closing in on enemies and pummelling through shields. Simply press the X button on either controller and punch your arm forward. The repulsors and punching were the only two combat mechanics that were shown off at the demo, though if you note the lead image of this post, there's likely to at least be a Unibeam weapon as well.
These weapons came in handy when Stark's personal jet came under fire from a swarm of hacked air combat drones. After being sucked out of a gaping hole in the side of the jet, the second half of the demo consisted of me trying to capture the various parts of the suit before I hit the ground. From there it was a simple matter of flying back up to the jet, beating and blasting multiple waves of UAVs who would attack from all angles, and plucking Pepper Potts from the forward landing gear where she'd been dangling before the damaged jet blew apart entirely. Didn't even break a sweat.