Since you used the same screenshot as we did, I decided to review yours first! Reading many of the reviews below, I feel many NGers can really be nicer. This happens in all game jams, so don't get discouraged by them!
The first thing is that I TOTALLY LOVE your concept! Never have I seen anything like it before. To me, having a great game idea is the hardest thing in game development, maybe even harder than fixing bugs!
The difficulty was, of course, the most important problem with your game. I suggest implementing a lives or HP system of some sort. Also, you might consider adding some wildcard tiles that go both to the top and to the bottom. Also, you shouldn't add so many obstacles in the beginning. Consider making an easy tutorial level instead of a how-to section. A tutorial level gives people the sense that they've achieved 'something', and will encourage them to KEEP PLAYING! Keep the hard levels to the middle of the game!
All in all, game jams are about prototyping new ideas or, as Austin always says, 'rapidly create video game designs and inject new ideas into the industry'. I think you've done a great job at that. Congrats! :)