I lost grappling hook though. Progress didn't save. Have to beat 2nd boss again which I can't.
I mean most people give up without beating him and i struggled with him too, so feel free to do the same, you've seen most of what the game has to offer it doesn't change fundamentally the more you play it.
My experience playing the game was being killed about 12 times by the first boss, 4 or 5 times by 2nd, beat 3rd on first go, 4th took a couple of attempts mostly because i went into the fight with a couple of malfunctions and a tiny sliver of health, died once on the fifth level and beat 6th level on first attempt (with mostly terrible rng for that last level).
The difficulty level is genuinely stupid and bad and deserves criticism but you'd have just moved on if the game itself wasn't pretty fun and strong.
Losing the grappling hook sucks, it opens up a lot of extra areas and makes a pretty big difference. I guess suspend your run before turning the game off to avoid save game shenanigans?