W to jump. A and D for left and right. Press S to enter a door. Click to use an item. Q opens the editor and Z changes selected item.
The purple cubes will be invisible they are only visible to place them. I know that its very very broken but I can't remember how to fix it and I don't plan on finishing it. There are building/placing mechanics, animated fire that can hurt you, water physics, rooms that you can go in and out of, player animations, and a seamless level and background.