Its a great game and you've done really well with whats in it, but like everyone is saying, at least add new guns. The special items (medi packs, amm packs, ect.) are good, just some more primary and secondary weapons. Not even that many more, just like 2 more primary guns and a new secondary would freshen stuff up.
Also maybe some sort of jungle map, to really let the Lean feature stand out.