sandman366's review was great and sums up all the strengths and weaknesses nicely.
just to reiterate some of the most apparent issues:
-gravity is indeed way too strong. made aiming quite annoying.
-i found that hit boxes didn't make sense. in the early levels, the short green guys would have arrows pass right through them and act as if they weren't even hit.
-having no target/outlined path (like in angry birds) or at least the option of one via upgrades was a bit annoying, but this was mainly due to how absurdly strong gravity was.
-having challenges, objectives, AND achievements was a bit ridiculous. those all sound like the same or close to the same thing.
-also i'm not a huge fan of the "go to our sponsor to play a more feature unlocked version of the game" this is nonsense. if you don't feel comfortable showcasing your work, then you probably shouldn't upload it at all.
i did like the music and sound effects and felt that the game was polished enough and mostly bug free. it was the design that bothered me.