Thanks for playing and for the great comment!
I'm a beginner in game development (this is my second gamejam), and it's true that it's not easy to make a game quickly! My teammates and I had planned a longer game, but we had to reduce the scope a bit to manage to complete it.
I'm also pleased with the water effect. It wasn't very difficult to do, as I mainly used third party shaders. It did the job, but I really need to learn shader programming to be able to respond more precisely to my needs in the future.