I have a list of stuff you should fix:
1: Set the graphics settings to medium by default
2: When Necrons spawn in the game freezes for half a second
3: More particles! When the head of a Necron falls off it looks great! Add some around Necron shots, sparks when an hit lands, ect. (if you want have the scarabs explode when they die)
4: The bolter rounds don't explode
5: The bolter has no reload, the pistol does
6: Chansword just swings, make it more like the chainsaw in Doom 2.
But that's about it, you made a great MVP (minimum viable product) so just keep working till its done!