Bloons TD 6 Primary Expertise and his synergies (BTD6 v9.1)

A CHIMPS run using Ballista as main attack to discover how the Primary Expertise can be combined with other towers with the best power/cost efficiency.
No other 5 Tier towers around.

Platform: iPad Pro
Game Version: 9.1
video speed: 8x

Main music:
Sinking
By Jellybean/reflect
Info about this music:

In my edit is slightly accelerated

End Music:
Breakdown
By [Ramosa]-/-[Oblivion]
Info about this music:

this music is only 15 kb, samples, notes and effects included!

Bloons TD 6,BTD6,Primary Expertise,CHIMPS,Ballista,