Gosh, what an atrocious set of themes. This marks my first voting round where I haven't +1'd a single theme. Well, here goes:

*It's not a bug it's a feature (-1): *Trash.

*You can't save them all (0): *Not, terrible. It adds an interesting twist on the usual "You Won at Everything!" message we get at the end of most games. However, it doesn't give me many interesting ideas or concepts. Bit subjective.

*You are the final boss (-1): *A more specific and even worse version of "You are the enemy". Specifying that you are not only 'a' boss but also the 'final' boss kind of ruins it for me even more. If it was just the previously mentioned theme this is clearly inspired from it would've gotten a 0.

*Death is useful (-1): *Non-theme (rogue lite), also too vague.

*Find it, Protect it (-1): *Too Gameplay specific. I also don't like how it sounds more like an order than a theme, though that's a bit of a personal qualm.

*Shadows (-1): *Vague one-word theme.

*Light is dangerous (-1): *Same as 'Safe in the Dark' from yesterday.

*The game rules change after ea.. (-1): *God, what a sentence, specific, tells me a mechanic. Trash.

*Floating Islands (0): *Floating is a random pointless requirement that ruins an otherwise workable 'place' theme. Otherwise if 'floating' was slashed it could have been a good theme.

*The more you use an action, the worse it will perform (-1): *LAWL TOO FUNNY.

*You control the environment not the character (0): *It got a +1 last time round. Now I realised it could force many games to have unfun game mechanics. Though it is workable otherwise.

*Craft your own magic (-1): *Game mechanic, not a theme.

*I have been here before (-1): *Vague as all balls.

*You aren't the main character (-1): *Someone already made a post on how this theme is physically impossible to implement.

*Shelter (0): *Could be interpreted as "Taking Shelter" or "Protect the Shelter" some interesting stories or mechanics can come from this but it's not my taste.

*Night is coming (-1): *Day and night cycle. Vague.

Let's hope none of these themes go through.