A great platformer with excellent physics-based mechanics. I’d say this is impressive for just 11 hours of work. Congratulations on that!
One thing I really liked is that, even though the core gameplay loop is simple, the obstacles and level design make the gameplay varied and challenging enough to keep players engaged until the very end.
Although I felt that the trajectory indicated by the arrow could have been a bit more accurate (which sometimes led to some frustration), I’d say it’s polished enough to let players enjoy the game without too much difficulty.
One thing that would undoubtedly add a lot to the scenery and immersion is a parallax effect in the background. This kind of effect usually adds a lot of visual appeal, and in your game, which is set on a beach, it would be a great way to make the visuals even more beautiful.
The game is easy to understand and very straightforward to play, which makes it a great fit for game jams, where people are often looking for something they can pick up and enjoy quickly.
Congratulations on the project, and best of luck in the jam!