You can now undo your last move. Just press the 'X' key on your keyboard or press the 'B' button on a gamepad (Xbox 360 style controller). This should make the game less frustrating.
Also fixed the bug where barrels and crates could block the lever.
Undo Button Added
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 10196623 · public branch
Steam updated · First observed