I don't think Joker should block attack cards only. If he did, it would make him a white knight protecting people. I can imagine that such a protector-reaction would generally be an interesting idea ("no player is affected by the attack"), but it hardly fits on a card representing someone you dislike.
This is a valid thematic point. Joker will take some more work / thought, and I might just leave him as a terrible card.
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Any more thoughts on Lounge? It seems somewhere between Oasis and Fishing Village, which was kind of the intent. $1 money, $1 action for no draw and an even smaller handsize. A tier worse than Horse Traders too. It's just really weak in some specific situations and decent in others.
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So here's a few more cards to consider as well.
Name: Flake
Type: Action
Cost: $3
Effect: +3 Cards, +1 Action, Trash this card.
Thematically, it's a representation of all of those really cool but unfortunately super busy people we've met at university. School sucks you away from fun a lot, and we've all been this guy, but when they're around everything's much better, and they always seem to know everyone. So a one shot double Laboratory seemed like a cool concept.
In the early game, imagine opening with this and a low cost power card like Remake, Sea Hag, Ambassador, even Chapel. You can sacrifice a Silver to get a guaranteed early play of your power 4 with a good Buy phase to boot. That's awesome. And I could see this being a neat card to inject into an Engine if you hit $11 in the later parts of the game. I'd say it's too strong, but it's got quite the opportunity cost, I guess.
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Name: Businessman
Type: Action - Attack
Cost: $5
Effect: +$2, +1 Buy. [dramatic horizontal line] While this is in play, when you buy a card, each player with 4 [3?] or more cards in hand discards a card from their hand.
This card needs work, and might just not be a workable concept. The idea is that it's a Goons or Merchant Guild or whatever but as a discard attack. This produces some weird but workable interactions with Moat, Secret Chamber, Horse Traders. The problem is, at "with 4 or more cards", it's all but a worse Militia (though the Buy is nice), and at "with 3 or more cards", you can leave people with a 2 card hand. It's difficult to get +2 Buy, as you need a fairly specific kind of deck to hit that consistently, but if you can, that's just cruel and you can do it every turn. Any tweaks would be appreciated. Maybe it's fine as an almost worse Militia that gives you an extra Buy you feel obligated to use.
Theme wise, one of our friends is really good at money. Does budgeting for campus clubs, always seems to find funds somewhere for our club projects, and is generally just financially oriented. He's also got this kind of secret agent / covert operative vibe, like he could take people down if he needed to. Seems like a legitimate use for a discard attack. And the more things he gets for you, the better, right?