Bullet collision
 

I am making a new shooting system.
How can I trigger an action of my baddie when it collides with the temp.npc("Bullet")
--(trigger "onHurt")

With that, how do I check if a player is within the x,y of the bullet for player collision?

(onPlayerTouchsMe) will only work when player runs into bullet. Not vise-versa.

If you really want your projectiles to be NPCs, you probably want to check for players and NPCs in a timeout. You can probably reduce the work a little by checking if you're on a wall first which is probably cheaper than checking every player/NPC to see if there is an overlap. Even if you use move this won't be a very efficient or responsive method of creating projectiles.

A much better approach is to either use the default shooting mechanism (if you can deal with the limits it has) or re-create projectiles clientside using the showimg features (Sales and I did this for Era, although it was never used).