Just to echo some of the previous comments, this is most definitely a higher variance slot than pretty much all of NetEnt's output of late, I've only done a few thousand spins but I'd certainly put it into the Wild Rockets category (I'd call that at medium variance), maybe even over that and into the medium-high category.
There seems to be far more of the RTP up in the 200-500x pay range, but of course to compensate for that lots of smaller wins are removed from the paytable, there are lots of dead spins, and plenty of very poor paying bonus rounds.
However, once it gets going with those sticky wilds, and particularly the expanding wilds in free spins, there are some serious wins to be had.
It's all been free play for me up to now, but this is a NetEnt slot I'd actually consider playing with real cash......
As ever though with a higher variance slot, match your stake to bankroll if you want to 'guarantee' * some decent playtime and wins, unless you don't mind the possibility of a seriously horrible and brutally quick bust out.
* Not that there's any guarantee of anything on a random slot, but the lower your stake relative to your bankroll, the better chance you have of riding out the peaks and troughs.