4th boss: Indestrukto tank
It is invulnerable and can't be damaged by bullets, its weakness is the fuel.
It will run out of fuel in 45 seconds, so delay its movements the best way you can.
Final boss: Tom Fulp
When he spawns a beard in the bottom-right screen will show up,
click on it and put it in his face.
Check out my latest NEWS POST on Portal Defense here:
dragonjet.newgrounds.com/
news/post/117974
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I don't know why but I don't seem to be getting into the Defense Games collection
Please help recommend it :(