Answer 1

Pull the camera back and down a little bit at the point where you drop after defeating the 5th enemy (there's 4 flying in a row). It's a little too hard to know exactly when to dash at the bottom when you can't see far enough ahead. You always want to give players time to prepare for something like that, or it's just not fair.
I would also personally like to see one or two more checkpoints (such as in between the start of the level and the first checkpoint). You could see it as making the level easier, but every single part of the level is still just as hard while the level as a whole is less frustrating. It's not a big problem with this level though, there's just about enough checkpoints I think.

Answer 2

op is kill