I only have one quibble and that is the response time after landing (from a jump) to a roll is a bit spotty. I noticed that you have to make at least one frame of running animation before the game will recognize AN input. I stress this as if you anticipate the roll an hit down slightly before you land (i.e., you hold left and down together as you are about to land) the game only registers the left input, and not the down input. This may be a bug, and should be looked into. Other wise the controls were super tight! (I'm over looking the slide stops, as games like this actually benefit from a bit of "play" in that area as it can be vital in adding those crucial microseconds to your momentum so that you miss a hazard. Another beef I have is that you give us good easy levels to get used to the controls, and learn the moves before you throw the hard stuff, but then you don't provide us with the same luxury after giving us the jet pack power up. You just kind of throw us in and assume that it will make the game easier/more fun, when in reality all you did was make the levels more obnoxious right after doing so. So I think you're level ordering might need a bit of tweaking. (design was fine, I just think you ordered them incorrectly in places.)
As a Super Meat Boy and N fan, I give you all my 5 stars, Sir. It's definitely well put together, gameplay, aesthetics and sound wise (I especially find this important, something that SMB is stellar in).
If I were to mention something I'd like to be improved is to have the jump height range being wider, especially being able to have a lower minimum jump height added to the jump mechanics. 5 stars, regardless.
I haven't beaten it but I got up to the level where you get the jet pack. Very, very good game. Perfect controls. Simple art style and so far no lag. Obviously Meatboy inspired but you do enough different things to separate the two. No complaints here. Great game. And I would buy a Steam release.
Hard, yet, addicting.
1st world reminds me alot of super meatboy