That was unexpected, but a lot of fun!
I really enjoy the duality of it, having two different control schemes and purposes (to be honest, I purposely did not read the page text before playing to see if the game told me how it works, and just played infinite ammo tower-defense for a looooong time before I realised I could right-click to move!), and the game has quite a bit more complexity and fun to it when you start moving around!
I feel like there is a good balance between the movement speed of the drone and the mech, but it would have been nice if the ammo was limited, and the drone could do single points of damage or something when moving around (to keep it interesting),
All in all, I think it came together really nicely, and had quite a bit of fun!
Great job, that was really cool!