Запрос на слияние 'dev-2' (#3) из dev-2 в master

Update readme

Refactor and make a simple level

Add factories

Fix collisions, add bullets and explosions

Update readme

Refactor and make a simple level

Add factories

Fix collisions, add bullets and explosions

Remove shadows in sprites

Remove old collisions, improve current ones

Improve collision algorithm

Optimize collisions

Add a better collision system

Refactor sprite animation

Add sprite animation, add explosion and bullet

Add sprite renderer, add loading

Fix resolution issue, refactor game ending