Just watched the video!
At the very least, I'm personally very unsatisfied with what's left of the characters and lore in the version I submitted. The first draft had more explanation of the setting and an actual separate character arc for each of the sisters, but alas, 2/3 of the game just wasn't fun and I made the choice to make major cuts so close to the deadline without giving myself time to fill in the gaps. ^^;
I do think it's better game for that choice, but wow is it a significantly weaker story.
That said, giving the sisters differences from a gameplay standpoint totally never crossed my mind! It seems like such an obvious thing in hindsight and I feel really silly now! xD
If I ever expand on this concept I'll definitely have to do that.
On the other hand onscreen timer I did try, but it felt extraneous to me. Though a large part of that is probably just a personal quirk; I've never been fond of timers in puzzle games and similar genres. But, um, yeah, creating actual tension would be even more important in a longer thing. I'll have to consider how to approach that if I ever do come back to this.
But yeah, long ramble aside, thanks so much for playing, and thanks especially for your comments and advice!