Nice Music and good puzzle game.
But there so little thing about metroidvania aspect, so I can't give a high score on metroidvania.
Overwind haven't any usage in current map but it's not a problem, I assume you can add some if you have time, due to you have nice level design on current stage.
Just want to say, if you have time and continue this as "Metroidvania" game, it's better separate Overwind as ability.
Time Rewind mechanic is Cool, but isn't that difficult for level design of a "Metroidvania" game ? how you cook them ? I hope I can taste it.