What my game is doing now:

• Setting a new standard for ugly programmer art
• Spawning buildings for the wall to crush
• Minimap at the bottom right to move the viewport left and right, the wall needs some room to grow
• Spawn new pieces for the wall(forgot to spawn any before I took the screenshot)

Next on my list is adding resources, make the interface elements for expanding the wall and health for the pieces. The wall will lose health when it crushes something, so in addition to expand and upgrade it you will have to repair it as you go.

The two red wall icons is where you can build new pieces for the wall. These will move further out as you expand the wall.