Add alternate seed completion goals

[SageGamer]

idea 1
- goal to beat mutated protopet in challenge mode, idea is so you can loop twice or more with checks for mega weapons and progressive checks for items you need to get twice

idea 2

• boss options to beat more or alternate bosses to goal making it easier or harder

[evilwb]

Idea 1

We've had some requests for including challenge mode in the past but are vary unlikely to do anything with it. We already borrow some mechanics from challenge mode during normal mode. For that and a few other reasons, doing challenge mode would present many design considerations that I'm not really interested in sorting out.

The other major problem is a technical one. We currently make lots of changes to code and repurpose lots of seemingly unused variables from the base game. None of this has been tested on whether it breaks anything in challenge mode and I don't want to add the extra overhead of having to test every change for compatibility in challenge mode.

Idea 2

I like this and could see this being implemented in the future so I'm going to leave this issue up with some modifications. No planned ETA though.