Move - with the mouse Stamp - Click Flip through pages - left and right arrow keys Inventory - press E (and hold it till you want to close the inventory in which you let go of the E key). Mix Colors / Combine - Space bar over a color
NOTE: Definitely not a finished product and will go through a good number of changes, feel free to remix (go wild!). There are only 2 levels in the game right now (more that nothing am I right? I will go back and add more levels).