One of the achievements cards "kamikaze" awards you for "run over 3 enemies". If you are not allowed to deliberately collide with a blocked space is this only achievable by being scroll-pushed?
You can move into enemies. See the box at the bottom right in the rules on page 9.
The definition of a Blocking Object is that it blocks player shots. See the summary on page 15.
So just run over them bastards!!