The game that inspired Battleships Forever. If you enjoy space shooters, you will probably agree with me their most fun element is fighting gigantic, badass, fire-spreading bosses. Well, in Warning Forever, that's what you will be doing from beginning to the end.
In a nutshell, Warning Forever is a vertically-scrolling dojin shmup. Every level starts with a siren and a big "Warning" on-screen. You better get ready. Suddenly, your little green vector-graphics fighter is eclipsed by a gargantuan mother ship shooting bullets and laser waves at you. Move! Dodge! Beat it! Yeah, beat the baddie, but how? This is where the tricky part comes. With no thugs before the boss, you haven't picked up any power-ups, so this is going to be a bit unbalanced; and aiming at the boss is not an easy task, at least the first few times you try. You can rotate around your firing arc, spread it wide open or condense the firing-power, in order to destroy the multiple weapon-mounted mechanical arms that make up the boss. Depending on how quickly you beat the boss, and which parts of it you destroy first, the next level will star a different enemy -- thus, you won't encounter the same levels each time you play, and the game inherently adjusts its difficulty level through AI, greatly increasing repeat playability.
The game is frenetic, addictive, smart and, definitely, cool. The massive bosses make it feel like an epic battle, you a David against gigantic Goliaths, but in space and with vector graphics.
Tyrian meets Shadow of the Colossus. A must.