im fucking scared to start this because i am afraid of bad endings (are there even a phobia like that?), but hey, i remember i survived Echo without getting most of the bad ends so i might as well give this a shot.
Don't be afraid of bad endings here and don't think you've done something wrong if you get one. Reading through and experiencing them is just part of the game and sometimes necessary to find passwords.
The bad ends are necessary as most passwords you need for the vault are in them. Echo is just depression is VN form. Password has more nuance and isn't just doom no matter the choices you make. Any bad end leads to the better end, remember to save when you can go the vault.
Don't worry. Getting the bad endings are actually very useful in this game, because they will help you in figuring out the passwords for the good ending (i.e noone has to die).