Thanks for the feedback !
For the exit of level 2, it's below the ocean. You can find you way through the lowest part of the cave. I knew I should have done some playtest :') And I think it could bea good idea to have a "dezoom" function with right click, to have a better view of the around the player.
For the gameplay, as I asked to @yonixw, do you think this a problem of level design or a problem of gameplay ? I rushed the level creation so maybe the level design don't completly feat with the gameplay