Yes, if you like (Windows only). Your Humble download page will have a Steam Key for you to use. If you can’t find your download page, go to the Humble Order Resender and enter the email address you used to pre-order the game.
If you would prefer to wait for the finished product, you will still be able to redeem your pre-order key when the final game is released. This is also when Mac/Linux/DRM-free non-Steam options will become available via your Humble download page.
Posted in: Buying the Game