I think what Clement means is that right now you have to click on the icon in the bottom right to select that ability and then proceed to move your mouse and fire your arrow. Instead making the player press a keybind like the '1' button on your keyboard to select the cold arrow would probably feel quicker and more natural to the player. I'll be honest i didn't know how to use the abilities for a while because i made the assumption that they already worked this way.
I enjoyed playing this game and loved hearing the little voice lines, they really added to the game. The models look solid too.
I agree with the three points in the above comment and think they would make a great addition. Keep up the good work!