Yah not out in Canada, yet, but imminent I have update that will be out next week or maybe even before the weekend I hope. I just want to say that the action does start very easy, slow and <shudder> may seem a bit boring, but once you hit 30 things get really hard. It's cause I made it easy so kids like my 7 year old brother could get into it and even a few of my non gamer friends won't be easily destroyed. Also the level 40 boss is right now too overpowered (but next update will fix that). I have an update that's still waiting for review that will fix some of this and balance a few issues and then another update that I will do after that that will increase difficulty earlier by a bit more. The Android version will have this out the gate, unfortunately but that's Apple's approval process for you.
I'm only up to the first boss, but what about a hardcore mode that just throws the hardest enemies at the player? Game is great btw