Hey man, nice work!
I know some people on here might not want that screen resolution if it's a windowed application. Make sure along the way that your project could scale back to VGA and still be readable/playable.
Those turret sprites, are they hand-crafted? Well, mouse craf-- you get what I mean.
Anyway, you see how your Bomb Turret is the only easily recognizable one among them? You've done a good job making them all differ from each other, but the focal point is always going to be the big circle at the base. Take your time and make sure each of the turret bases are also unique from each other - different shapes, colors, ect - and I think you'll see a huge improvement.
One thing I do like are (what I presume to be shader effects) on the star background in the title screen. You should consider using similar techniques in background layers to produce a dynamic look during gameplay as well.
Looking forward to seeing more!