I thought on this for a while, and whether you should be able to delete the screen and then start at the checkpoint again, or if I should I should allow people to restart the game from the beginning.
The work around was that the restart the level is kind of built into this page.
The only thing I'm thinking of adding (after the Jam finishes) is a button to remove the last placement, that way the player doesn't fully get stuck.
All that said though, thanks for playing and I'm glad you enjoy parts of it.