I wrote it in the unfinished/incomplete section, but I thought writing here will be more helpful, so I removed that topic, and moved it here.
Now, the plan has became (relatively) more solid, so I'm putting my plan and question in spoiler part.
The plan is about the final boss. It has three phases, and Second phase is an avoidance(not a music-based one) now the problem is that the second phase includes a pure RNG madness, and avoidance itself is a couple of minutes long. So I was thinking about placing an antosave in the final phase. That way, even if you get killed in the final phase, you don't have to spend your 2+α(time you spend fighting the first phase) minutes and you can focus on the final phase.
So, here's my question : Should I place an autosave in the final phase or not?
(I'm doing my best to to require less luck and more skill, but it's still random. I'm afraid you'll need to deal with it.)
p.s. Should I move it again to Help, Suggestions, and Feedback section?