Thank you very much. I've finally decided to stop thinking about doing something and after the years of just updating Unity since v4 tried to do and finish something playable. Maybe it would be better for the next time to finish all basic Unity tutorials before, would save much time :-) With the physic simulation I have complicated implementation of the AI, because it needed to take velocity into account. The small enemies are inspired by Boids, they follow the player, keep distance between themselves and from obstacles, it isnt implemented optimally, but works somehow :-) Towing is just Unity joint component so at the end its only about placing it right.