I downloaded this app, thinking that I would be able to easily hook it up to a switch from school, only to find out, I could not locate a blue tooth switch from the list (I work at a non profit school for kids with delays - and we use switches every day). The developer clearly states which switches have been successful. They also encourage email requests, if your switch doesn't work, and they will try to help you out. I think this shows their level of commitment.
This review is based on using this app, in its alternate mode - of tapping on the screen. Space Invaders is like the older arcade game, with the same name. In it, you have rows of armies that you must target and shoot down before they destroy or consume your space ship. Once a level has been achieved, you battle the Boss. The controls are simple; tap and you shoot, and then it directs your space ship in the opposite way. This is a great game for kids who are limited mortorically, but want to play video games like their peers. There are many options to customize this app, from varying the speed and timing of either the user or the rate the invading ships come down to the appearance to increase the contrast (for low vision kids). My only complaint is that there is no exit button once you are in the game. You have to play it to the end to start over or use it with another player. Recommended.