I have a bit of insight into "Darkness is your friend" that might make it seem a bit less frustrating than it does currently. I'm not gonna try to change the way anybody thinks or say that it's a "Great" theme, and I certainly understand why people don't look fondly at it, but just so we're covering all bases and know everything we should...
The theme doesn't necessarily force a specific game mechanic. If it said "stay in darkness to survive" or "you can only move when inside darkness" then yes, instant minus 1 from me. Thankfully, however, there's a subtle underside to it. If darkness is your "friend", so to speak, what does that limit your gameplay to? At face value, probably a lot, but since we're talking about what your friends are and not what your style of movement or abilities are, there is a lot of room for making connections that weren't originally there. Example:
"Darkness (uncountable noun, easy to take non-literally) is your (for the player, the character, or all characters?) friend (reinterpretable noun, part of many different proverbs, can mean a reverse-hindrance to gameplay but very easily to a literal friend with NPC or story-based significance)"
A sentient refraction of missing light is your companion and ally
Jump from platform to platform and use the shroud of darkness as solid bridges and weapon/defense methods

This is why the theme may be just a bit misunderstood. It sounds like something about a weird puzzle mechanic where you gotta avoid light, but logically there are a lot of possible scenarios where it's not. It could be anything ranging from a survival game about being a pillbug that thrives in damp, dim areas of soil under a plant, to a branching-decisions story game about how you're being assisted by the forces of darkness and literally Satan himself. Darkness itself is such a poetically broad word, as well, that you could quite feasibly end up with a game about depression, or a perfect excuse to make a really grimdark story.

So yeah, I'm not gonna tell you how to vote, but I think everyone should know that DIYF isn't narrow, it's actually quite open.