keyboard aiming is to hard to get it aligned right. If you just do accuracy for certain guns and make the gun inaccurate if you hold down left mouse button (like in seek and dread online) it'll be perfect.
My personal preference is emulating the movement of a first person shooter when doing a top down shooter.
Basically this means you have a mouse pointer which the Player is always looking towards, but make so they rotate towards in with the Direction Calculator for instance, so you can't turn around instantly.
Then you have the arrow keys...or WSAD kinda keys...for moving forward, back, left and right, so much exactly the same as first person style movement.
Makes it reasonably challenging and authentic.
MUGGUS
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I also like more the Mouse shooting, but the problem is that I want my game to have a 2 players mode and is almost impossible to use the Mouse Shooting. Maybe in the 2 player mode I can use the keyboard shooting? Or you guys have another idea?
I don't know what kind of good top down shooter movement you can do without the mouse at all. Plus i think that a 2 player shooter game that shares the keyboard just doesnt work very well..not enough room and such. You should just make it a LAN or internet multiplayer game.