yeah the game is pretty hard, I'm trying to tone down the difficulty so I am working on an update!
Here are a few things-
Killing humans cost 50 Holy Energy
Flames do not kill you
Human bullets are meant to hurt you because you aren't supposed to be in the middle of them fighting
You probably did kill a human behind those vines, I think I might place it farther away from the vines
Demons do indeed shove bombs away but bombs can be instantly exploded with fire
Bombs stay in the air for about a second before falling down the jumping off of them mechanic was really janky but I made a fix on it and it'll be in the next update
also fire kills humans which might've been why the fire "killed" you
Thanks for playing by the way!