Main description: This asset allows you to create dynamically generated backgrounds from sprites, with support for parallax effects and seamless wrapping at the room's borders. It can be used for many situations, not only space-themed projects. Implementation is quite easy and straightforward!
LITE VERSION: LACKS FEATURES SUCH AS PER-LAYER EDITING (AND MANY OTHER THINGS)
If you enjoy this asset a lot, then you should definitely get the paid version, it offers a lot more, including full control over each layer, check it out here: https://marketplace.yoyogames.com/assets/1664/dynamic-backgrounds
DEMO (full!): http://tinyurl.com/nphjrng
DEV THREAD: http://tinyurl.com/ml3fx5k
FULL VERSION: http://tinyurl.com/o8uqxkl
Feature list (lite):
How to use:
Version 1.1.1. Published March 26, 2015
Created with GameMaker: Studio v1.4.1567
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Does what it says, works as advertised
Well commented... too well commented- to the point I can't easily browse the code in places. I would move the bulk of your comments into a standalone help document, and/or eliminate any empty or decorative new lines that aren't absolutely needed. Thumbs up otherwise.