This is a pretty good idea, however to improve i would say 1) make the buttons easier to press (just make 'em larger) 2) make it self cleaning, people like a gun we can fire easily 3) avoid using INSL in proton targets, as protons don't penetrate INSL, its the lava from the rest of the melted target that causes it to set fire. As a final persomal point i'd say improve the looks a little, i think a weapon like this would suit a more sleek design, hope this helps!
not bad, you should make it smaller, it's too big like that. (not using walls is a good tip for making things smaller)
tempted to tag it TrumpBreath