I tried making the controls as simple as possible, but there is something inheritably difficult to get used to about controlling two characters that move independently of each other. However they are easier to control when close together and the flamethrower combo + the double score encourages this play style, but retrieving the gas still often requires separation so I completely understand your frustration. I didn't really notice it while I was playtesting because I was pretty much already used to the controls, so having playtesters be able to point out things I've never noticed about my own game is really helpful!