Developers are not fixing the game. Oh well.

When I start the game and it flashes on the screen and closes.

Little over hour and a half into the game and some of my forms have run out of quests? And the game hasn't told me how to get more, and I can't find it anywhere online... And then some enemies have immunties so it forces you to switch, when I (personally) would rather stick to one or two of my favorites rather than what the devs want me to? Are there mods? Or difficulty settings?...

just bought the dlc and i was hoping to play mechanic but it says continue playing to unlock this form so im wondering how far i gotta get before i get mechanic

I've seen a few videos floating around here and there of people beating this but I am massively struggling. It's the only achievement I need (besides NG+) to 100% the game. Does anyone know any ways to cheese it? Can you play multiplayer and bring in a friend to watch other lanes? The mains strat I've tried is Boo/Hive Swarm/Rattler Turret/Arrow Flurry but I often fumble my inputs and the Rattler turrets have a bad habit of shooting the wrong target/slow down too much to hit in time....