I wrote an article meant to help you better understand each parameter with image examples. You can find it linked in the project page.
If you just want to go ahead and play, here's a quick cheatsheet:
DENSITY:
controls the total number of elements in the piece. if you want to save time you should try to keep it low until you find the general feel you are looking for.
BOOST DENSITY:
can boost the overall density past the maximum setting (but takes longer to calculate). You might want to lock it OFF until the very end of the creation process.
SEED:
play with it to find new placements for the shapes, new color distributions for your palette, new shapes distributions, new settings for your arrangement, etc. This is where you will find that special combination you're after.
FORMAT:
the proportion and orientation of the canvas.
MARGIN:
the size of the margins around the piece.
ARRANGEMENT:
controls the rotation of each element and plays an important role in the overall cohesion of the piece.
SIZE BIAS:
likeliness for the elements' sizes.
SHAPE VARIETY:
controls how many types of shapes are used in the piece.
PALETTE:
the set of colors.
DETACHMENT:
defines the unity between line drawing and painting, as well as the roughness and distortion of the painting.
MUTATION:
controls the variable nuances of each element.
TEXTURE:
the intensity of the painting texture.
MIRRORED SHAPES:
toggles the possibility for elements to be drawn mirrored.
---
WARNING: The paper texture can create an undesired moiré effect when the view is scaled down. Because of that I disabled it when you're not at 100% scale.
PRESS "1" to toggle the view size (fit screen / 100% scale).
PRESS "T" to toggle the texture on/off.
PRESS "S" to save current view.
PRESS "H" to re-render in high resolution.