A fatebound effect is the text on a card placed after either the lightbound or darkbound symbol. I ran into is that the Android SDK on Eclipse uses 3 shortcuts that all start with Alt+Shift+A, so if you type that, you'll be given a choice of continuing with D, S, or R. Jeff Lemire and Mike Deodato Jr. introduce us to a bleak and barren world that is a sea of violence and blood.
In the end, it boils down to whether or not you enjoyed the first Line Rider (read the full info here). If you found yourself really addicted, Line Rider 2: Unbound might be worth a look. But, if you're like me and checked it out, then promptly found it shallow and not particularly exciting, you may want to take a pass. It's not a bad game; there are some good ideas here, and once you get a handle on the creation mechanics, then it's a fairly satisfying game. Still, the inconsistencies in difficulty and almost unfairly-steep learning curve are tough to overlook. The community features are impressive, and if that really appeals to you, then I guess checking out Line Rider 2 is probably worth it.