-Basics
You play as a featureless person thing going against another featureless person thing. Each turn you and your opponent must choose rather to attack or defend, if you/they choose to attack then you'll get a random number from 1 to 10, then attack doing the amount of damage from the number you got. If you choose to defend then if the opponent attacks their damage will be cut in half (or no damage if they rolled a 1). Both you and your opponent have 100 HP, so just keep attacking until you or them reach 0. Also, after every like 15 turns, the minimal number you can get goes up by 1, so 1-10 > 2-10 > 3-10 and so on in order to speed up the game.

-Alternative Play
Although only having one "game mode" would be easy to understand (and code), it would get real boring real fast. So in an attempt to combat this, there'll get ~4 different rule options. (Names may not appear in the final).

0-10: Same as normal but there a chance you'll roll a 0 and whiff an attack doing no damage.

Stun & Crits: Attacks now have a chance to either stun your opponent for a turn or land a crit doing more damage.

Tanky: You and your opponent have a lot more HP.

Wrackathong: You and your opponent can't defend, nor play... Just set back as AI play and hope to RNGesus you get bigger numbers.

Double Trouble: Instead of controlling 1 character, you control 2.

-Cosmetics
After winning a game you'll get points which you can spend on cosmetic accessories, hair, victory animations and other stuff.

-Tournament Mode
A story mode of sorts. A single player PvE mode which pits you against a series of characters in order to become a grand champion. Also in order to make it more fair your attacks now have a QTE which does more damage if you get it right and 3 lives.

Thoughts, questions?