Basically hex codes work like these. It begins with a #. The six digits represent the colour 'ratio' R for red, G for green and B for Blue. E.g. #RRGGBB. Now for the numbers in ascending order: 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e and f. Notice there are 16 of 'em, that's the HEX in hex codes. Now go mix and match! #FF00FF would give a mix of full red and full blue, something along the lines of pink (Note that you're mixing light, and not dye.)
room of improvements: Live creep status checker(instead of depending on the color of creep for hp, i would also love to see their hp go down getting burned), more towers(lol), more creep variety, new modes. Otherwise, 3.6/5.
This game can be easily replicated using pencil and paper, even then, more advanced techniques have been implemented in these pencil and paper games. Not an excellent game but a good game nonetheless.
 "Midas"){kind=icon}
 "Mutilate-a-doll"){kind=icon}
 "Synapsis 2"){kind=icon}
 "Snailiad"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "ShellShock Live"){kind=icon}
 "Frantic 2"){kind=icon}
 "Infectonator : World Dominator"){kind=icon}
 "Streamline"){kind=icon}
 "Epic Battle Fantasy 3"){kind=icon}
 "Love"){kind=icon}
 "Great Dungeon in the Sky"){kind=icon}
 "TETRIS'D: The Game"){kind=icon}
 "Heavy Weapons"){kind=icon}
 "Plazma Burst: Forward to the past"){kind=icon}
 "Silver Maze"){kind=icon}
 "The Enchanted Cave"){kind=icon}
 "Robot Wants Kitty"){kind=icon}
 "Colony"){kind=icon}