[Fix] - Proper Game class instanciation

[lafusew]

Game instance

Current behavior

Game class instantiation isn't properly understood and replays cause Game class to duplicates itself and breaks the game.

Wanted behavior

Being able to instantiate and re-instantiate the game through the Game constructor.

How

We might have to distinct Game class from "Engine" which handles the Canvas, the deltaTime and all rendering methods.

• Add todos or create distinct issues when we know how we could do it.