Same for me, this is one of the first games in a very long time that's kept me playing for hours without me enough knowing until I see its 3am or something.
With that said, i can understand someone getting tired of the game already. Single player was over pretty fast, i found almost all the scrolls on my first play of each level apart from 4 of them, which I went back and got pretty quickly.
I love playing battle mode but its same maps on repeat until they switch the order around 4 hours later.
Right now i still have that feeling of wanting to play more of the game, but when i do, i get a little bored of whats on offer. There needs to be more modes, maps and just more stuff to do and right now there isn't. Its certainly the reason why I'm not playing it as much the past couple of days.
Its still an incredible game though and the most fun i've had in ages.