Great demo! I always like games that have more complex reload mechanics (Beyond citadel my GOAT). I appreciate having multiple types of jams for the M4 with varying levels of actions required to clear the jam. Being able to tap the forward assist after chambering a round (even if it doesn't do anything AFAIK) is a really cool touch. Animation's for reloading are very smooth when going between actions on different button presses.
A few things to note. Having no first person aiming is a missed opportunity IMO. I'd like more precision for long range shooting. The white crosshair conflicts with the white skybox past the glass at the last level, so you can't see your crosshair if it's on top of the glass. Having an option to change the color of the crosshair to blue/orange (or any color the player desires) would be a good feature.
Also, a neat thing to have would be a quickdraw for your sidearm if your primary suffers a jam that's hard to clear quickly. Just having the sidearm be one handed with rifle braced in left arm would be cool aesthetically IMO.
BTW, for the presumably red COMTACs like headset on aria, are the 2 bottom parts battery packs, or does she have 4 ears?