It is not only possible, but also very easy, we will gladly help you but just like codah said, we can't teach you all the construct2 basics in this post, read the beginner tutorials and once you encouter a specific issue come back here and you will get an answer. Start by making a layout, add all the sprites and the mouse object, make the aim display follow the mouse pointer every tick and the gun image follow the pointer on the x axis, add the shooting animation and after this is done, make the star go on a random position inside the layout every x seconds. Than you just need to add an "on clicked object" for the star, triggering the scoring system which has more than enough tutorials.
Best of luck with your project!