I appreciate that you've coded in C# which is more difficult than JS.
The art is consistent. Overall - a well executed project!
I think level 3 is not working correctly - it is not possible to reach the portal, one more run is necessary? Level 5 seems to be the same situation... Maybe have two buttons "Reset action sequence" and "Restart level"? I was thinking that if I press reset I would be able to execute more actions from the current position. But it repositions the robot at the start.
UPDATE Making the selection with click besides drag and drop would make it more user friendly. Especially at the start it may be confusing how it works. Or maybe a short tutorial?