Cont.) Unlock a New abilitie qnd a New Weapon, and So on for all of them. It would add a New Challenge for Players. also, it may be a Bit Of a Stretch, but Maybe you could add an Achievement System. Like when you beat Lvl 1, you get one, and So on. and If you unlock half the Weapons you get one, and When you Unlock all of them you get one. It would give players Self Satisfaction. Thats All for Now