The blocks that are freezing in time when you click them are a good mechanic, but it was't that exploited until the last level. Also, it tried to explainthe mechanic with the blocks falling to lava, but I foudn a bug here that allowed me to jump on lava, so I didn't had to use it.
The restarting the level after dead or at will in a plataformer wasn't a very original idea, since it was what most other games did, but your idea sticked to the jam, as you had to reset the level to get the coin and the ending of the level. Sadly, this is not a very original implementation of the theme.
The sound got the job done, it was a short loop that setted the mood for the game, not terribly oog, but not bad either. Of all the mechanics you added, I think the freezing block when restart is the oen that shows the most potential, and that add an interesting twist to the genre you chose for your game.
In general, there were a lot of bugs that broke the level design that you had intended, from colliders sticking character to the walls to infinite jumping. But for a jam game, this is ok!
Congrats!
Please play our game!