Under rating threshold (hideshow)
What makes this a great game: 1) perfect tower system & tower balance 2) unique maps layout 3) simple yet effective armor system 4) overall perfect game balance 5) iron challenge 6) great graphics 7) relatively fast-paced despite no speed up button
Simply the best tower defense game along with its sequel (i slightly prefer the sequel becuase of the more interesting ennemies though)
Under rating threshold (hideshow)
I think that you should make a better save system since some people clear browser cookies/history etc. If you clear it, your data disappears