Pretty nice game
what can i say? it's simple, yet very fun, although you might wanna make it slightly larger perhaps? and change the sounds around abit...I heard the same sounds over and over again and it got a little annoying after awhile...a little variety wouldn't kill anyone (i'd hope) also, maybe make a small path for the background? not just the same trench over and over again, maybe make some scenery or something, like set levels.
all in all though, good game