Needs fixing.
It is impossible to build momentum prior to a jump. When the guy jumps, it's like straight up and then a teensy tiny bit to the right or left, depending on which direction you're going in. This makes it nearly impossible to land on a ledge that's higher up, as well as clearing spikes or a gap. What you need to do is add a run button. That would make this game a lot more enjoyable to play. A save feature would be nice, as well.
Other than that, there are no bugs or gltiches that I am aware of. It seems to work pretty well. It's just that the level designs and the controls need improving.