Super fun game and mechanic, really captivating. Great job!
I think you could have made the tiles that turn off and on a bit more clear. Sometimes it's a bit confusing to know if I can pass through them or not.
And honestly in the beggining the bar above the player is not super clear I was sure if it was a timer or if it was the amount of characters I had to unlock because it does not start full.
And super small detail but maybe the music stays throughout the levels instead of reseting each time.