It is hard, but I think you should try.

I do find this game difficult to master, but not that hard to play. One big thing I don't like is even the menu I have to shoot. You can click left or right.

There are 2 ways of doing this; consecutive shooting and round shooting. Choose what technique is okay with you, or do both. Personally, I do both, depending on the situation. I recommend trying this kind of endless game.