I played through the demo and while I do like what's on offer, there are a few things I want to bring up:
1.) The objective system is too silent. What I mean by this is that the objectives do not update or ping the player when they complete them. It does get annoying when player completes the missions and gets no notification of any updates to the scenario such as notifying the player when they have completed an objective and where to exfiltrate the area.
2.) The handling of the extra weaponry is awkward. I've been more used to MechWarrior's handling of different weaponry where each weapon or weapon group is bound to a number to use them. Having to cycle through the non-handheld weaponry, while familiar to Armored Core's style of weapon handling, can get tedious, especially when mounting a bunch of them onto the Mech itself.
3.) The stat screen needs something similar to Armored Core or MechWarrior's stat screen where the player can look up a separate screen that shows all current stats in detail.