Upgrade Rework

[oak oyster]

Secret Tunnel: make that your unit can be teleport back to defense yard by standing in the centre Tower for 1s

Tower spawn:
Dead tower: Remove level 3, make the Dead target Structure only
Spiriton: Remove level 3, make Spearton target every enemy unit

Castle Archer: make it cost 300 gold for level 1

Miner wall: Im not gonna talk about this cus idk what to tell

Pike: change the level purpose, level 1 will enable Ranged Enchanment for pike and level 2 will enable ability to deal extra 10 damage

Miner upgrade: this one destroy your gold mine too fast so
Level 1: spawn a gold mine in your yard
Level 2: spawn another gold mine in your yard
Level 3: spawn another 2 gold mine in your yard
(Vault give infinite gold to user so I dont think this is OP at all)

[bold yoke]

The Miner upgrade, good. The rest no, hell no.

Especially the dead tower spawn

What's the purpose of them attacking only structures?

[sand python]

tank until they reach the statue

[bold yoke]

bruh

The Spiriton one

Sure

Yes

[sand python]

the Spiriton currently is Spear distract without UC

[pliant dragon]

Zombie Apocalypse Upgrade does not need changes imo.
Pike is fine.
Spiriton is good.
Castle Archer is yes.
Miner Upgrade change is garbage. It's good that they burn your gold mines faster, why need 4 extra gold mines if they'll be useless the entire game, because most of the games end before you run out of gold mines.
Unless of course you mean you keep the current Miner upgrade stuff while adding a gold mine, that's good, however I think 1 extra gold mine is good enough for level 3.

[plain monolith]

how about this
we could keep the old miner upgrade
but lvl 2 spawns a gold mine and lvl 3 spawns a crystal mine