Head's up this is an honest feedback, so if you don't want to read this comment just skip or delete this.
Anyways congratulations on finishing a game within a period of 7 days. Nice work man.
And just note, I didn't finish playing your game (I don't play a lot of platformers just MOBAs, but I made some platformers). In advance, I'm so sorry if I hurt your feelings and just delete this if you don't want to see this.
Now here is my feedback:
Adherence to the theme: I can't see the "REWIND" in your game. But your game looks a lot like "A Normal Dungeon" (a submission to the Community Game Jam last year with a theme of "A GAME IS A LIAR"). Rewind is not tangible in your game however. You can maybe make the hero have a sort of power like a rewind (just check the game Braid if you don't know). I'm not really fond of stories in games aside from Hollow Knight which have a deep lore but in this game jam, I think that the core mechanic is the most important and not the story of the game.
Controls / Game Design: The controls are decent but could be improved. You could add a timer both to the jump (this is called Coyote Time, check Jonas Tyroller videos on platformers) and grounded time. The game must be forgiving for the players, and players comes first. The attack is cool in my opinion but it could be more impactful. Additionally, the camera movement was not really directing where I want to go. If the player walks towards the left, the camera must pan more to the left side leaving the player on the right side. And I can't see the bottom of the player if I want to go down. And add a SCREEN SHAKE.
Graphics: The pixel art is good but I won't judge you for it because I know that many people are different artist I'll just commend you for your effort to make a pixel art with animations. Plus the lighting and is good but could be better. A little criticism for the colors of the lighting, a better color palette next time.
Fun: It is okay for this jam but could be improved. I think that you lack on your core mechanic. If you want some fighting in your game, add the ability to rewind like Ekko from League of Legends for example. Your game might be fun to some but this type of game is not for me.
Innovation: It is not innovative, the game lacks something that makes the game stand out among others. The game was there but the execution not so much.
Audio: Maybe some background music. The ambience sounds good but maybe you just want to keep the lighting to a minimum to make the environments looks cool.
Please don't take it too seriously. Have a nice day man.