Alright so I was looking at the spring trap and thought... Why not be able to upgrade it? Well, what if you could be able to upgrade spring traps. I mean it's the only trap not able to upgrade. I would think it would be cool if after the spring trap goes off it launches a little bomb out and the bomb explodes causing damage to the units around it. I mean just one extra level of the spring trap so it brings something interesting to it. Just my thoughts. Thanks!

