Thank you for your feeback, the audio of the game is a big focus I plan to develop correctly so that weapons, music and sound effects have the proper 'umf' and not have he current place holder effects which I agree sound a bit weak for the theme of the game. I am developing a few maps too including a trench one like you suggest, there is a basic storyline in the works too so that there is a reason for the levels that you play etc.
This project is still in development, though I am having to work on 95% my self at the moment so progress is abit slow but comments like this give me great motivation to put more hours into it where I can.
Thank you for your support :)