Alien Formations You Can Actually Clear
Galaxy Blasters is the closest thing here to the original arcade template: your ship slides left and right along the bottom of the screen, the laser fires on its own, and a grid of invaders descends while shooting back. You get three lives and a win condition, which is rarer than it sounds - destroy every invader and the game is genuinely over. Cosmic Crusher and Cosmic Crusher 2 take the opposite approach. Both are endless vertical shooters you steer by touch or mouse, both drop coins from dead enemies, and both spend those coins in a shop between runs. The sequel is the harder of the two and throws green UFOs that shoot back with red lasers.