Hopefully the points I'm trying to make are still obvious. Also, this helps me vote, so even if you don't like it, it works for me.

It's not a bug, it's a feature (-1): I'm not gonna up-vote your buggy games, now way. Maybe if you add a nice ladybug with nice attractive features. But I'm not going to spend days to find and abuse your bugs. I'm not a speedrunner.
You can't save them all (+1): Saving can be done on a wide variety of levels. Saving something from the garbage, to saving a species from extinction. I think we will see a lot of games where you save helpless princes from barely defended fortresses, they keep appearing on other ones. No wonder we can't save them all.
You are the final boss (+1): Me:"Hey you there!", Mirror:"Myes?", Me:"It's your turn to be the final boss!", Mirror:"Oh :(". This can be fun, but I don't see an awful lot of different ideas. Some of which are pretty hard to implement anyways if you want a proper boss fight.
Hello, Death is useful (+1), my old friend. I've come to talk with you again. Once more you came in this round creeping. An idea while I was sleeping, but once again this vision has left my brain. Such a shame.
Find it, protect it (0): Spend a lot of time obtaining object X. A timer starts, object X gets stolen in the last second. We are salty. The end. (Where X is a capturable flag, a defendable ancient or a secret dungeon rich of shiny diamonds your greedy peers are not supposed to know about.
Shadows (+1) Round 2's Safe in the dark, but a bit more abstract, it solves all my negative comments on it. But it might be a tad too abstract. Ah well.
Light is dangerous (-1): Wait, what did I just say. There is already Safe in the dark, this implies that. While Safe in the dark does not imply that light is dangerous, just sure to be safe. Nah-ah, you are too limiting. Goodbye.
The game rules change after each failure (+1): "So the game was too hard for you? Okay, let's make it a bit easier." I hate it when games do that. The other option is kind of like represented in pretty much like all the like Rogue-likes. I like.
Floating islands (-1) Let me quote a friend: "ok im not sure i like this one its just absurd i dont even know how youre supposed to add more players or make your own npcs that have shark heads -1"- Nuff said. (Because I don't want to add him admitting his "scathing mockery".)
the more you use an action the worse it will perform (+1): the more you use capitalisation and punctuation the worse the readability will be
also due to inflation of words i propose the use of the word inflation instead
this is a decent theme anyways when used properly i think
You control the environment, not player (+1): Another recurring theme. It's not a bad one, just requires you to have a player. I do love me some lemming though. So up you go.
Craft your own magic (-1): So we craft spells and potions? And we get the freedom to chose how we do this crafting? That's very generous of you.
I have been here before (0): "Wait did I submit this? I don't remember. Darnit where is my screen cap of that. It's properly clickbaitey, and half decent but not great. Meets all the requirements. I guess I'll claim this one to be mine." - Me trying to be meta, but failing due to seeing the end of this post, and I don't want to give my sarcasm module full control.
You are not the main character (0): Good, because I don't need one anyways. "Wait, I need one now, that is not me, otherwise people don't get the how the theme is implemented?" "Ugh".
"Quickly, find Shelter (-1), Night is coming (-1)." "Where?", "Ask guess Steve, Wilson, or that Badger

It still turned out a tinsey bit hateful at points. Oops. Though I did do my most up-votes yet.