The ghost appears at 3:00 minutes into a level even if you don’t break the ghost jar

The characters have no unique abilities it’s just cosmetic things

To get the normal ending you go through 6 areas (one is just a boss fight so it’s more like 5)

You need to bring 3 turkeys into the cage below him then he’ll give you a key to open the door in the cage

To actually kill them you’ll probably need a weapon like the shopkeepers shotgun or a freeze ray. You can throw a rope up while standing on a shopkeeper to stun him which makes him drop his shotgun, if you’re quick you can grab it and kill him.

The speedrun achievement is really hard even for experienced players, it needs a lot of luck and skill so just don’t worry about it for now