Thank you so much for the feedback! Here is some info about how I achieved the weird look.
1) All LAYERS of the LAYOUT are set to TRANSPARENT in the layer properties (including the bottom/background layer). This causes the "streaking" effect - not sure exactly how it works, something to do with screen redrawing or such. A little trick/exploit that I thought looked really cool :)
2) I'm using the WebGL "SKETCH" effect over the whole layout. This, from what I can tell, draws an outline around all objects. If objects are overlapping, then the shape of the two (or more) objects gets an outline. It's a cool effect and I really like how it looked (for the Non-WebGL version, I'm creating B&W versions of the assets to approximate the look, not the same, but there you go)
3) The particle effects are just straight out of the box Construct2 default settings (since I didn't have any clue what I was doing lol), but I liked the look, so I just kept them! (I did "design" the particles with little shapes on the one "frame" and set the cone to 360, maybe some other minor tweaks). For the "mobile version", I have to finesse them a bit (though I am finding the collisions are killing my FPS more than the particles!)
4) No fancy math or nuthin', just good ol' physics collisions! I like just seeing what happens. I've always enjoyed "real world games" of making up stuff in the backyard with a ball and a wall, so I was kind of going for that with this.
I appreciate the questions! Hope I answered them - happy to explain more!