I Really liked the game, played about 8 runs and it stayed compelling. The waves require different tactics, and the enemies each add something meaningful to the combat.
My favorite part is how the fire point being forward and to the right of your hitbox results in interesting gameplay. It made the environment more interesting by letting you take advantage of corners and cover. It also made the base enemy much more of a threat because you are unable to shoot it if it gets to close.
My main complaints are that the gunfire sound effect is rather anemic, and the fact that you can fire indefinitely without penalty makes it optimal to just hold down M1 the whole game.
I only found one bug where the shielders would get stuck and not move from their spawn points now and then.
Overall I was very happy with the experience and will likely play more. I hope Fennec adds more content!