If you look at where you would buy and sell ( at the end of each bar with a dot on it) you will see that you would be frequently "whipsawed", in other words being forced to buy high and sell low repeatedly, taking losses. Occasionally you will get a good run in one direction, but this will not compensate for long strings of losses.
It looks good because the blue dots are below the red dots- but work out where you would actually enter each trade and you will see they are mostly losses!