The moment I started playing this game, I knew something was wrong. I went to look at the controls, and the screen came up behind the level I was on. THIS GAME IS CANCER. DO NOT BUY/PLAY.
Everything about this game screams 'baby's first programming attempt'. The game relies solely on randomly generated levels, which often contain impossible jumps and walled-off spikes, and offers little more gameplay than jumping (of which you can double-jump, but ONLY if you jump first - no fall-jumping) and shooting blocks to get to the end of a map. Enemies are little more than moving dangers - one hit of which will send you back to the beginning. Becareful of projectiles too, as hitting one (which kills you) will cause it to remain floating in the air, making some maps impossible to complete (as the stationary object will still kill you on touch).
I say this not out of spite - I know everybody has to start somewhere - but you can find better games for free on flash sites. Paying for this game would be a waste of any money. I can't remember how this came to be in my library - possibly by a Humble Bundle - but be assured that after this single sitting, I have no reason to ever come back to this poor excuse of a game.
EDIT 1: I finally made it to a level that was literally impossible to reach the end of. Luckily the developer foresaw this and gives you a 'regenerate' button on the menu. Known your generation system is that flaw to put a failsafe in is quite something. Oh, and I hope you like the first three bosses, because you'll be seeing them again.
EDIT 2: Having played two hours and 8 bosses worth of levels, the story (a scentence between levels) just loops, with no ending or purpose. They might as well be blank loading screens, as there is no payoff, no cohesive story, and NO END TO THE GAME. This is nothing but a worseless, waste of time. Yes there are challenge levels, they're nearly impossible to do.
This game is randomly generated. Infinitely long. Handles like ♥♥♥♥. Campaign is too easy. Challenges are too hard. There are three enemy-types, which all might as well just be moving spikes. I have seen better games for free on Newgrounds, so do yourself a favour and give this a wide berth.