Well first of all, welcome to the danmakufu scene.
Anyway, lets get down to it. There is a fine line between difficult and impossible. This however, is pure impossible and unfair. Sudden attacks that are extremely fast to the point where it is impossible to react to them is big no no. Before making something hard, start with making it actually possible to clear. Of course, this is probably your first time making something so it is ok to make mistakes like these, however it is always best to learn early.
Regardless, it is always nice to see new people so keep at it.