[Defense / Survival] Theory crafting for hero castle defense

[SnowYell]

Hi,
I am trying to make a cool and simple map for me and my friends.

I consider making a map, where you defend a castle with your team of custom heroes. This makes you able to theory craft and set up combos.

You will fight waves of enemies and boss fights to gather loot and prepare for next wave.

It'll be a mix between Custom Hero Survival and Custom Hero Line Wars. I want to add some cool elements to the customization, which makes abilities alter each other making a more in-depth customization.

Also I wish to make some kind of augments through out the game like in TFT etc.

Do you guys have any experience with this to make a great repetitive mini-game of this kind?

Thanks