I made a short run and gun game for a game jam. But it feels a little flat to me. What should I add to make the game more enjoyable? I'm thinking vehicles or some sort of mech suits. Any feedback would be appreciated. Here's the link R.A.C. Spec Ops by TweNty GAmEs  

When played in browser, the full-screen button seems to do nothing and target circle is for some reason always on the character during combat.