Fellow Unreal Engineer! Very bold to go for water and buoyancy in a game jam but you nailed it - the water and reflections look great and the wake behind the boat is very nice.
Boat - cute
Characters - cute
Growing flowers - win
I would recommend increasing the turn rate of the ship, it felt very hard to turn. Also some background sound would sell the emersion, doesn't have to be music, just some background water sounds would do it. Also, for UE games, having an escape menu with a quit button is usually best otherwise you have to Alt-F4 out.
Good work! Keep doing water games - that was fun!