Nicely done! Speed up is a nice addition. What is the health if you lose once someone reaches you? Or was it that a special character reached my castle going from 100 to 0 at once?
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Every time they go around you loose health, and they upgrade an elite tier and get stronger (Icons in how to play), when a boss goes through, its an insta kill. So you shoudn't let them through, but some weaker enemies have to go around a few times to get one shot capability.
Bosses spawn starting from round 10, its a bit challenging, but a good strategy of magic orbs can beat the first ones easily.
Thanks for the feedback though.