Wow thank you, for playing and for the feedback.
Probably for the second level i will have to leave a little more in sight the platform that is only accessible with the double jump and the dash, the distance between platform are indeed to force the player to use the dash.
I will take the dizziness problem, it is probably due to the small bricks that move at the same speed as the player, perhaps adding a parallax effect reduces the visual shock it causes (and also reducing the movement of the camera a bit)