Oh heck yes a game that doesn't directly link pronouns to gender presentation is always a hint the person that wrote it is LGBTQ themselves (if the gleefully obstentatious amount of lesbians wasn't enough of a hint either). This gets my seal of approval immediately.
Excellent start, very useable based on mastermind, a touch disapointing now as a playthrough is giving me a fair share of blanks once I solve the puzzle; will definitely play again once more is written.
Your core concept is solid, just needs to be filled out.
Suggestions on how to proceed:
First: finish the introduction, that feels core.
Second: finish the 'base game'.
Third: Although ideas and thoughts are good, Finish step 2 before doing anything more than think about more. Too many plans/ideas will overwhelm you and burn you out.
Unsolicited ideas/suggestions: That being said, I like your ideas of new game+ and such, a random idea, however, is her having one or more of her convention friends over 'next year' since year 1 was so fun. focusing in on a colour? Adding subtypes or combonation-types? ("Well, no green this year, but if we combine our magic, mixing the red and purple gets us... okay, orange makes some sense... more sense than combining blue and purple to make pink did.")
Interesting premise, but far too unfinished at this point. The game doesn't provide details on what the spells do, and doesn't provide nearly enough feedback on what you're doing, right or wrong. You're left trying to randomly guess and hope that you stumble upon something.
Well its interesting if a little too incomplete to really assess yet especially since it seems to be based on mastermind (5 colours in correct order to cast the spells). So its hard to tell if something is incomplete or simply didn't trigger this play through. I'm hoping there'll be some TG later as a group of 5 girls seems personally a bit less likely than a mixed group especially since in my experience guy's are more likelly to play the "go into the spooky old house to prove yourself" shenanigans.
I enjoy the concept, but the intro being unfinished as it is makes me unsure of what the spells do, although i did find the little notes on what the spells did, but the number of tries and combination of spells made it feel a little narrower of an idea, i do hope you put more content to this, as it does show some promise.