it would be great if you made it so that you can download it from here aswell for players who dont have steam. (just my opinion)
p.s. i know it relies on steam servers but maybe bring back the old servers too?
The capsule materials are customizable by just modifying the material texture.
renderer.material.mainTexture = yourTexture;
Death effects are just prefabs instantiated when the player dies. A different prefab is used depending on the death effect. They contain things like particle systems and animators to achieve the effects.