First, log in to playground.com.

From there, type https://playground.com/me into your address bar and hit enter/return. You'll be directed to your profile page with your gallery of images.

From there, you can quickly download individual images by clicking on the Download icon in the upper left hand corner of each image.

Or, you can also bulk download (multiple images) by (1) clicking "Select Images", (2) clicking on all the images you want downloaded and (3) clicking the "Download" button. You can bulk select all images in between two given images by clicking on the first image and then clicking Shift+click on the second image. You can bulk download up to 250 images at a time.