I love little puzzle games (actually any puzzle game). I think there is a lot of potential with this game. It seems like you have a creative flair for puzzle making as well.
I felt the game needed a bit more of teaching the player the various ways puzzles can be overcome. i'm left still uncertain whether jumping on the triangle baddies makes my guy jump higher? I am stuck in the middle of level two because I cannot jump high enough to escape.
Also, (and I know I'm probably too harsh here) but the rewind thing here only seems to work on platforms, maybe a little bit on the bad guys...? It doesn't have a very visual and convincing rewind effect. But obviously I'm not judging you for failing to recreate Braid for a 31-day game jam lol.
I'm left disappointed because I don't now the trick to finishing your levels, but it seems to me that I don't understand some of the gameplay mechanics rather than me not knowing how to solve a puzzle (i.e. it's more of a technical challenge rather than a puzzle challenge).
Visuals, I like, this seems - for the lack of a better word - a cute game. As I mentioned above, this could be a great little app for a smartphone if you stick with it.
Anyway I'm trying to build an action/adventure type 3rd person puzzle game myself with time travel as a theme. (i.e. think of TombRaider / Uncharted type with lots of puzzles around the time travel theme). Connect with me outside this game jam if you're interested as I need more creative ideas for puzzles. Though I have to warn you I'm a C++/Unreal type of guy :p