Thanks for Playing :)
Yeah thats a known bug by now, will be fixed :D They get stuck because of randomly placed object directly in their designated spawn point. I spend alot of time with the wheel, upgrades and pathfinding (optimization mostly q.q) so I sadly had little time in the end for playtesting and bugfixes.
It does not happen alot so by pressing retry you could have gotten the full experience :)
The enemys try to find a path to you, if there is none they will target the destroyable objects until they can get to you again to exactly prevent castle building :D
Ill definitely add a light glow effect to the tickets, were even harder to find at the start withoug movement, the shadow and see-through objects but my eyes are also not very good in spotting this little fella.