What to do when your game is too easy and too hard?

My instinct is that one of the following two things is actually the problem:

1) There is a particular method of play that essentially trivializes the game (i.e. "If I walk into the corner and hold down this button, I win automatically.")

2) You're going for too broad a player base. Not everyone is going to be equally good at your game. From the perspective of the player, your game actually has different difficulty levels depending on the player. This is normal and expected. Nothing wrong with trying to tune the difficulty to where the most people are happy, but you're not going to make everyone happy.

My first impulse is that this means your game is just boring. See this chart:

    ^   \good/
    |    \  /
 int|  too\/too
 ere| easy/\hard
  st|    /  \
    |   /    \
    |  /boring\
    |
    +--difficulty-->

The games above the NE-SW line are rewarding. The games above the NW-SE line are challenging. Perhaps your game doesn't offer enough reward for the challenge or enough challenge for the reward.

The first thing I'd do is boo you for using Google Analytics. But I forgive you since I don't have a JS api yet. Here's how I handle balancing for my games:

http://playtomic.com/blog/post/9-trickochet-launched-today

http://playtomic.com/blog/post/10-an-update-on-trickochet

Fix the balancing issues.