Alien invasion (itch) (dvh)

Alien invasion is a 2D space shooter game. You control small spaceship and shoot aliens. Each new level introduce new kind of alien. Some aliens drop gold which can be used to improve ship. Some aliens can shoot back. When you collect enough gold you can buy ship improvements in the shop. Aliens cause damage to ship when they are too close or when they shoot at your ship.

W,A,S,D - ship movement
Mouse - aim
Mouse left button - shoot