Soulkeep - What to do to Level Five Fiends?

Level five in league 1 which is the final level is so hard to be passed and need many tries so I am going to play it today and see what I can do with it and with my towers that should survive for 8 waves and this is for beginners who just playing league 1 is not easy.

I will use my common cards that has low mana and they are card sharp which become a basic card that can eliminate all fiends that I have faced and also Fountain of terror which also a tower with a good range that can kill fiends from a large distance and also I gonna use Gloom Owl it is a good tower and with 60 Mana only.

Charnel pit is a tower of choice for every player and we can use cheapo to get a discount on it and for spells the good time will be with stew of doom and venus fiendtrap and also I will use Cheapo as I have said to get a discount on charnel pit to use it for 82 Mana instead of 120.

Actually I want to try this level till I reach wave 8 or 7 at least and see all fiends and their way so I can know how towers should I rent from the market to deal with those fiends but till this using common cards is good and upgrading them with gaining mana make them stronger.

I was able to pass 4 waves in that game as first three waves were so good and not so hard but when the way have changed I was facing so much fiends from more than one way so I was not able to defend both gates well and towers were not so powerful to be able to kill in both sides, So I need to get some towers from the market to continue the level from its 5 wave and to be ready to what I have seen.