Screenies of Dolce progress. Dolce is a simple 2D game framework on top of Allegro, using the D Programming Language. It handles much of the boilerplate and provides convenient utilities for making games with Allegro 5. Nothing exciting.
This looks really good. Nice improvement.
Two small pieces of advice. Make the artwork for you:
In this case you could use different shaped platforms, to allow players to quickly see what turret is what without zooming in. Even if just simple shapes; in fact using simple shapes as a foundation is a great idea.
Second, use references:
Even professional artist uses references. Lots of artist use simple shapes to make complex art. https://www.deviantart.com/tugodoomer/art/env-obj-52-573913173 Looking at their work should inspire some of your own ideas.
I Like the depth of the platforms and your roundness looks visually correct. Good work.