I think you can build this one out. The bones feel good for something fun if you have the vision. Expanding on the squad system, add some guns and mutators and a varied gameplay loop would make this a good game.
Thanks for the feedback! I recently just added a new mode for endless horde with roguelike elements which I plan to release after the voting session is over. Though your suggestions I will consider too, as it is indeed lack of player choice on squad and weaponry.