Only enjoyable for people who enjoy platforming puzzles. But even then, older games of this genre would beat this game..
However, it is now 2011. You'd think the game would be more richer and developed since people are familiar with the genre. However, the game itself and the levels are sparse and simple. The levels are extremely short and mostly consist of the precise jumping that can be so frustratingly annoying for these types of games. It's a choice between pain and pleasure. Action is simply jump and run, jump and run, hold jump. Hold jump. Hold jump. IF that's what makes you enjoy a game, then by all means play it. But as stated before, Super Mario (a game that is so much older) would beat this game in a heartbeat.
I'm thinking that the people who rate this game so highly value it's nostalgic retroplay.
In addition: It's interesting to note the contrast in scores between people about this game. Either they seem to "love it" or they absolutely hate it. As you can see, I'm in the latter group. Why do I have this crazy suspicion that all the high scoring reviews are submitted by the developers of the game. Or am I just being paranoid?