I like that the bullets of clones damage you, and that you can damage them if not careful.
I could see this work even cooler in 3d with prone, crouched and standing units, if you were to run with that idea of avoiding friendly fire.
I'm not sure if there is a better strategy, but doing minimal movement, and moving in a demi-circle on each new clone seems to be the dominant strategy though. It would be nice if there was more depth to have more variety in that, like maybe alternating obstacles on loops? Where you would have to think to shoot from 2 different angles to not have all your shots being useless, half the loops.
Good job, and have a great week.