I lost interest in NiBiRU, too. It's still on my computer because I got halfway through it and meant to finish it but I can't seem to drum up the interest to continue on. It wasn't a bad game, it just didn't catch my interest somehow. I think I found it too linear and I was relying on the walkthrough so much that it stopped being a game. Maybe my brain just doesn't work that way but some of the things I had to do would never have occurred to me without the walkthrough like...
...having to strap the dynamite onto the rat to get into the secret room. Maybe I just need further training in explosives.
I haven't uninstalled it because I hate to leave games unfinished so I probably should just go back and complete it.