This was really fun! I was confused at first when trying to WASD and spawning a lot of bricks. After figuring it out it was a nice platformer challenge to get to the end - the levels and progression were very nicely designed. Overall, the character controller felt great, and generally did what I wanted it to. I enjoy the game mechanic, however I was really paranoid about soft-locking myself. It would be nice to have some solution to remove bricks, whatever would play well with the game design.
Here's a playtest