Heh, nice one. Reminds me of the classic Sky Roads.
But there's some stuff to tweak:
1. The arrow buttons were overreactive in the menu.
2. The point of view in-game is very low, there's little overview of what's to come.
3. There's only two sides. I could stay just in the middle and always be safe just as long as one side was wood. I only had to jump over total gaps.
My suggestions:
1. Allow more tiles next to each other (this probably means, make the tiles smaller so more fit in).
2. Put in some additional tile types, like booster, glue, jump-pads that allow you to jump higher, some height difference perhaps. Whatever you can think of.
3. Put in an 'avatar'. A spaceship or frog if you like :P.
4. Some powerups or items could result in some interesting gameplay changes. Coins to add to the score, an activate-at-will speed modifier, a hover-powerup (temporary immunity to gaps), a score modifier... perhaps reward higher score for higher speed?
All in all, nice little game. Perhaps if you pick it up again you can make something real fun of this.