the author of this app says:
Place a bet on a slimy snail and help him make it to the finish line.
You will be cheering your snail on as you use the hardware keys to move him forward. To place your bet, choose a snail and how many shells you'd like to wager. Then tap "GO." This game is far more exciting than it sounds.
Before you know it, you'll be chanting "GO SNAIL, GO!"