This is an interesting concept for a game, and I definitely sees there are potentials. I mean, who never stepped on a lego brick?
But that's being said, there are still a lot of places where you can improve the game with. I think the most obvious thing is to make the foot react a bit if it stepped on the brick. I am totally expecting to see that pain in the artwork but sadly its not there. Also, another easy bit is to add sound, and that will dramatically makes the game feels more fun and complete. To give one more point I'd say adding some visual indication on how long before the foot stepped on the floor. It's a easy way to add tension and also would add some strategic depth to the game too!
Anyway, keep making games and keep up the good work!