I thought it was a good demo, but I just have one tiny suggestion:
The special ability buttons (i.e. "take cover" or "sprint") should all be toggled by one hotkey (or at least, there should be less hotkeys), so we wouldn't have to memorize all the different hotkeys. For units with more than one ability, there could be a hotkey for "special ability 2." When you have multiple types of units selected, you could "tab" through the different unit types (like Warcraft III) and the use the hotkey just for that one supgroup you have selected. Besides that, the special ability buttons could be a tad more prominent on the UI.