Looking at the source, they represent 5 directions (E, NE, N, NW, W) in which the doodle 'looks' for pads.

It would be difficult to train on the actual game because for training, you need to be able to simulate the game and run it very fast, to train it on the game in realtime would take forever. You also need to be able to access data from the game to give to the ai as input which is easier if you can write it into the source code. But if you could hack the real game to allow you to do those things then sure you could train on the real game.

This was done in processing

@@GreerViau I don't really understand what you mean. Can you describe the workflow in a simple way?

Shervin Koushan You can search “Processing” yourself

@@SamDaBest I didn't think he meant an actual application... Processing is a verb as well you know

@Shervin Koushan the word 'processing' is not a verb. and by 'proccesing' he/she meant a programming language

Originally it only had left and right, but someone commented on it being "jittery" so to fix that I gave it the option to stay still. But regardless the network evolved to not care about staying still.