Needs work.
A Simple Concept, but by the end you had to execute each jump flawlessly in order to progress. This wouldn't be quite so bad, except the game proceeded to get slower and slower with each level and it would refuse to acknowledge the pressing of the spacebar incredibly often. And no, I don't mean right after dying, I mean there were a few sequences where I'd have to either jump immediately after landing, or the very instant I left a tunnel, but the game wouldn't recognize my spacebar until the third or fourth hit, by which I'm already miles beyond where I needed to me. And after dying to the same jump 10, 20, 50 times, the music just got annoying.
If one could fix the lag, both in the game speed and the recognition of the space bar, then this game would be somewhat more entertaining than it is. And, for the record, 288 deaths for my first run-through.