Not bad! Considering the fact that it was made for Ludum Dare 28, I believe things went down on a hurry in this game. And that's what makes it really good. Had it been that the author had more time, he might have added some more features to it. The game has its own share of ups and downs. The ups being fast-paced gameplay, nice art-style, graphics and a cool sound track. On the downside, the enemies are immune to spikes/hazards. You die if you touch the enemy. There should have been some upgrade system, checkpoints or even a small storyline with some finite ending.
Nevertheless, a great effort by the author. Glad it made to the "featured list". Keep it up!