If it helps, here’s all existing tags.
#: 2 Player, 3D, 5 Minute.
A: Action, Adventure, Airport, Alien, Animal, Anime, Arcade, Arena Combat, Army, Art, Artillery, Asteroid, Atmospheric.
B: Balance, Balloon, Baseball, Basketball, Bike, Bird, Blackjack, Block, Bloons, BMX, Boat, Bomb, Bow, Bowling, Box, Boxhead, Brain, Bridge, Bubble, Bullet
Hell, Bunny, Business, Buttonhunt.
C: Car, Card, Casino, Castle, CCG, Cell, Checkers, Chess, Christmas, City, Colouring, Cooking, Cricket, Cute.
D: Dating, Defense, Detective, Devil, Dice, Difference, Dinosaur, Dirt Bike, Doctor, Domino, Dragon, Dress Up, Duck, Dungeon, Dwarf
E: Educational, Elephant, Emo, Endurance, Epic War, Escape.
F: Fantasy, Farm, Fashion, Fighting, Fire, Fish, Fishing, Flight, Food, Football, Funny.
G: Geography, Girl, Gladiator, God, Golf, Good Music, Gravity, Guitar, Gun.
H: Hair, Halloween, Hamster, Hedgehog, Helicopter, Hex, Hidden Object, Historical, Hockey, Holiday, Horror, Horse, HTML5, Hunting.
I: Idle, Interactive Fiction, Island, Isometric.
K: Keyboard Only, Kids, Kissing.
M: Magic, Mahjong, Makeup, Manager, Match 3, Math, Maze, Memory, Metroidvania, Military, Minigames, Minimalism, Mobile Friendly, Monkey, Monster, Monster Truck, Motorcycle, Mouse, Mouse Only, Multiplayer, Multiplication, Music, Mystery.
O: One Button.
P: Painting, Parking, Penguin, Pet, Philosophical, Physics, Pinball, Pipe, Pirate, Pixel, Plane, Platform, Point And Click, Poker, Police, Pong, Pool, Prison, Protector, Puzzle.
R: Racing, Rag Doll, Restaurant, Retro, Rhythm, Robot, Rocket, Rogue-Like, RPG, RTS, Running.
S: Sandbox, Santa, School, Science, Science Fiction, Shark, Shooter, Shootorial, Side Scrolling, Sim, Skateboard, Ski, Snape, Sniper, Snow, Soccer, Solitaire, Space, Spider, Sports, Stealth, Steampunk, Stencyl, Stick, Strategy, Submachine, Submarine, Sudoku, Superhero, Sword.
T: Tactical, Tag, Tank, Team, Tennis, Time Management, Top Down, Tower Defense, Train, Turn Based, Turtle, Tutorials, Tycoon, Typing.
V: Vampire, Vector, Virus.
W: War, Western, Wizard, Wolf, Word, Work.
I did this a little while ago and was going to include a list of all suggested tags, but there’s so many. As well, I found myself unable to be objective, and I was ignoring some of the really bad/irrelevant suggestions. The sheer volume made it a wasted venture, anyways.