Threshold is a 2D remake of the popular arcade game space invaders. The aliens have been replaced with bats and the tank has been replaced with a cool looking spaceship and the shields have been gotten rid of completely. There are a few things that have been added like the fuel gauge because the aim af the game is to get as far into space as you can without been destroyed. It is also possible for your laser guns to over heat and then you have to dodge the enemy until they cool down again.