Hi,
I tested this mission and it was juste so boring, the difficulty of this lvl keep on one thing, avoid turret's bullets and floor's traps.

if you add zombies, i'll suggest to add mini slag and ghost cat has in almire or delete zombies and keep with ghost has the name of the mission suggest it.
I mean that heart ice is actualy more difficult than this mission because you added devilish inside, and we can't use shyver myst.

If you want make a amazing lvl , at least add fast monster because with a shyver myst you can donne this mission easily

So in my opinion you should add:

-Cat or big black cat <- (muhuhahahah)
-More constuct Tree
-and maybe butterfly

Hmm also, the final boss is realy easy, juste add explosive ghost maybe or another boring monster like turret or buterfly bescause i can defeat him with out shield ...

Like that you can be sure that only experimented knights can pretend to succes this
stage with one hand

Dont forget Great Loot and maybe more prestige fo the harder dangerous mission that we ever seen

Great work anyway and thx for this new mission !

Best regard, Ouragonos