Composition is very good with the placement of the slide in the background, I am thinking getting in a little closer might have improved the composition by getting rid of some distracting elements.
Color
There is something off, looks a bit too pink/purple(esp. in the bark), did you change the colors/saturation? or does your camera give you this type of cast?
cropping and rotating a couple of pixels CCW would help with the tilt.
Nice leading line to have the viewer see the blue slide in the middle. I think that a closer in shot without the clutter around the equipment might have made for a stronger shot. Colors and saturation are good.
nice find, i like the framing of the other playground in the background. lighting is just okay - i wish you could have found an angle that didn't have some shadows crossing the lit parts. overall, however, its very fun (but no kids?)