Maddeningly difficult! But the ship control has a nice feel. I would try to make the movement a little more "floaty". This will increase the difficulty a little.
Check screen size? Think about using more of the screen space in the design?
Much better. I would edit your collision shapes so that the ship-cross collision is more precise. Use custom shapes for both ship and cross. Edit the sprite object to do this.
Challenging but perhaps maddening player movement. Try to get a more satisfying movement, keep the level of challenge, which might mean moving things around in the layout.
Pretty good!. Check screen size? perhaps you have deliberately used a smaller size.
Good degree of challenge. I would take a look at making collision shapes for the cross and the ship. This will give very precise collision. Would like a little bit more choice in terms of path taken.
Far too easy. The ship slows down too much too fast. There does seem to be any thought put into the level design. Win condition collision test seems to be off. I would have a think about how you can design the space to be more interesting.