Click on two components from opposite sides to fuse them together. Some don't fuse. There are 20 components to make. (Not counting the 4 you start with.) If you don't know what something is, hover your cursor over it and look at the bottom of the screen.
Almost all coding done by @LennyReeves. I just added a timer and a best time script. --> If the timer is switching from one number to the next at the end that means you got the lower of the two plus 0.5.<--