Please, for the love of god, use the dnd rules if you are going to make a dnd game.  Jump DOES NOT DO DAMAGE AND KNOCK PEOPLE PRONE, 4th lvl characters do not get two attacks a round without using action surge which is only usable once per short rest.  High ground doesn't give advantage.  Read the core rule books and use them.  Nothing makes a game more frustrating than one that cheats the rules as written.
Agreed again imersion was destroyed for me in this game so far.. as soon as i saw all these crazy rules i just lost interest.. Those friggin phase spiders were the last straw for me.. teleporting, poison aoe shooting insanity... wtrf.
Yeah i would have refunded if i could have after that.