I disagree that I Wanna Be The Guy is "TRUE difficulty". It's an UNFAIR difficulty. This is game is of insane difficulty already. But it is a FAIR difficulty. All the mistakes that happen are because you did something wrong. And you can plan your way even before you actually do it. In IWBTG that does not happen.
I didn't really enjoy it... I died a couple of times because I was just upgrading the cannon. That's a BIG mistake... upgrade your allies, then your cannon, then your allies again, then your shield, cannon, allies, cannon, allies, engine, shield, then gather enough for the triple shot and you'll finish it in a jiff!
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