I’ve been using the simple shooter as a bit of a sandbox and I’m not quite finished experimenting yet, but I have added a rather satisfying explosive barrel + grenade launcher complete with chain reactions. So I thought I’d share 
It feels a bit instantaneous at the moment so I may tweak that.
https://drive.google.com/file/d/1DsHZC0iuwu2dTRtZFtc2gm-1Z5eOg4G7/view?usp=sharing