Cute memory game. I liked your art style, and in particular the player character. Very pleasant to look at.
A nice interpretation of the theme too. Shame the timer did not work, would've added another dimension to the game.
For improvements, I'd second SpooceJuice and Over-Dramatics comments. Maybe add some Lego bricks for the player to step on as an obstacle too.
Well done for submitting a game within the timeframe!