If you saw the credits, you got to the ending. There are some parts you can get to that you might not have gotten to, but the only way to actually finish the game is to interact with the "Give up" prompt. There's no other ending.
I wanted to play with the idea of a hopeless situation that just gets more hopeless over time and instills that feeling in the player, so having there be a "good" ending kind of played against that. I considered having a "good" ending where you can reach the Saint if you do everything really well (i.e. you know which things to avoid and which things to pull, and know how to avoid damage), but I decided that I'd rather double down on the tone/theme I built this around (and even if I wanted to, I wouldn't have had time to implement it!).
Thanks for playing!