Really fun, the way the characters ragdoll and move I think adds a lot of character to the overall game, get Gang Beasts vibes. One thing I thought could add another layer of depth would be to have the ship actually rock and this make it even harder for the players to control the characters, I think this would add another layer of like incidental story telling between the 2 players.
Another thing is I didn't really feel a sense of impact when I struck the other player, I think this could be achieved through a sound effect and/or a physics effect when struck by the other player.
It did take me a while to figure what the pickups where actually doing, at first I thought they just changed the colour of the objects in game but I think these changed overall movement ? I think these having a name related to what they do appear on screen when picked up would help the players understand better.