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I definitely liked the style of it for sure, but I'll be honest not sure what to add next. If you're unsure you obviously don't need to expand the game right away, you could use the time to try other projects and come back later! Music is always a good addition, and sound effects as well.

If you make it not restart the level, make sure the player can restart easily in case they get stuck. 
If you can find a way to add an extra twist to it, like idk maybe later on the player gets the power to make the bricks they placed fall out of the air, something that adds on to the existing mechanic could be cool. 

Ultimately up to you and what you want to invest your time into