you can press 1,2, or 3 to morph, use WASD to move, and click to shoot. also, just a few things, in easy mode, only yellow & orange guys spawn, in normal mode, yellow, orange & red guys spawn, in hard mode, only orange & red guys spawn, And in superbuffed, only red guys spawn. Also, yellow guys need one shot to die, orange 2, and red 3. another thing, enemies can't get shot/hurt wile flashing, same with the player.
well, Apple_Eater helped me with some of it. (check him out btw)