I actually really like this game. A lot. I have had a blast with it. The one thing I do have a difficult time with are the controls. I have this installed on a Linux laptop that I use for some development work, and not on my main machine. It may work much better there, I'm not really sure. But the mouse controls on this laptop are horrible. It is very difficult to try to manage that piece with a touchpad while using the keyboard controls. I messed with it a bit, but I until I can get that part straightened out, I can't seem to pass a certain spot in the game. The sad part is that it shouldn't be difficult, but it is nearly impossible with the controls as they are working for me right now.

Seriously, get a mouse. I would not even be able to get any meaningful work done on a laptop without a mouse. I cannot even imagine playing games with touchpad.
Even the most basic mouse will be better than a touchpad.
If nothing else, just take the mouse from your main machine.

For good ergonomics you may also want to consider getting a cheap external keyboard.