docs: describe the game

PROPOSAL_123456789.md

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-# My proposal
-
-Lorem ipsum

PROPOSAL_20220552.md

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+# My proposal
+
+- name: Chaewon Lee
+- student ID: 20220552
+- [URL](https://git.prototyping.id/20220552/homework5)
+
+## Describe the game
+
+```
+what does the user have to accomplish? How do you win or lose? What type of interactions are possible?
+```
+
+**Orb.io** is a 3D survival game inspired by `.io-style` games, particularly [Slither.io](http://slither.com/io), reinterpreted in a _three-dimensional_ visual environment.
+
+The player controls a glowing sphere moving through a dark space filled with smaller orbs. While the gameplay mechanics are based on classic snake-like systems, the game presents them using 3D rendering and spatial depth.
+
+### Objective
+
+The player's goal is to survive as long as possible while collecting glowing orbs to increase their score and grow in size.
+
+### Core Mechanics
+
+- The player moves continuously across a 3D environment (constrained to a flat plane for clarity and control).
+- Small glowing orbs are scattered throughout the space.
+- When the player collects an orb, their score increases and their body grows longer.
+- The player leaves behind a trail of body segments that follow the head, forming a snake-like structure.
+- As the player grows, navigation becomes more difficult due to increased length and space constraints.
+
+### Win / Lose Conditions
+
+- There is no fixed win condition. The game is endless, and success is measured by the player's score and survival time.
+- The player loses if:
+  - They collide with their own body
+  - They hit obstacles or boundaries in the environment
+
+### Player Interactions
+
+The player can:
+
+- Control movement using keyboard (`WASD` or `arrow keys`) or mouse input
+- Collect orbs to grow and gain points
+- Avoid collisions with their own body and obstacles
+- Restart the game after losing
+
+The gameplay loop is simple and repetitive:
+`Play` → `Collect` → `Grow` → `Avoid` → `Fail` → `Restart`
+
+The simplicity of the mechanics allows for immediate understanding, while increasing difficulty creates tension and replayability.