Controls suck, You have to wait like a full second before it actually decides to move and it lacks a restart button if you screw up on the impossible badge.
Too easy when you get to maxed out bomb skill. I then just went back to the first levels and maxed the first few levels with just throwing bombs at them. Then I leveled up enough to make the rest of the game easy enough. Lvl 75 and haven't died for the last 20 levels and more.
I've noticed that the sound is stereo, which is a very nice effect. Also to all you complaining about Hexiom Connect being better, well firstly, this one is a lot harder and you have to think a lot more and secondly it's its predecessor. Think about it.