Hi!
I am surprised somebody actually bothered to download, play and then comment. The blueprint editor is janky and not well explained.
Use the gizmo on top as reference for where forward is. (Would be more useful to have an arrow that points where forward direction is, note to self.)
Scroll to rotate block
You can delete by selecting a block, then right click to delete.
Driving uses WASD layout, but you can also drift by holding space.