Version 1.1.0-alpha.3 is out

Version 1.1.0-alpha.3 is now available.

This is a rather small updating adding a new gameplay element: Walls
Walls aim to help the player by providing a bit of protection from alien fire.
Currently walls can only be destroyed by aliens, but the player can not shoot through them either. Player lazer shots get destroyed when hitting the wall. The new walls are placed in the third and fourth level.

Because the third level felt a bit difficult when testing, the fire rate of the player was increased to match the fourth level.