I would make the bricks a little bigger and keep their color a bit closer to the main wall color to make them look less like an “extra detail” added onto a smooth plastic wall.
Also, the vines could probably be simplified to fit the rest of the building style (thicker/less parts)
Other than that, anything with a shape/design similar to this could definitely work.
It looks great, sure, but it isn’t low poly. In fact, don’t even use the word “low poly” unless you’re referring specifically to 3D modelling and the practice of using low polygon count with the interest of performance, simplicity, rigging, etc.
Low Poly Is Not A Style.
It is, however, a really nice flat shading and textureless tower. A little busy in some areas so my eyes don’t know where the focus is, but otherwise it’s good.