The game had funny ragdoll physics but in terms of it being a fighting game it felt like you were fighting the movement rather than fighting each other as there seemed to be no real way of getting the other person off of the boat. Maybe a drag mechanic similar to gang beasts would work well, or maybe have the punch knock people back, or even have the ship sway so its harder to stay on.
The weather effects were a nice touch and we liked the ice one a lot as it varied the gameplay and kept it fresh. Despite this, it was hard to initially notice what each effect does, so maybe a symbol for each orb would work well.
In terms of originality, it interprets the fighting prompt in a different light, however is visually and mechanically similar to games such as gang beasts, but the inclusion of weather was a nice touch that we haven't seen in games before.
As well as giving the player more control over who wins, making it more obvious who the winner is would be helpful, potentially having a win screen or even some text just saying which player won.