All clues are pointing to SRIV not Gat out of Hell.
Windmills are likely from Valkyrie Chronicles.
I keep seeing people say Transistor, but I don't get it? The boom box? That looks like Lethal League or Jet Set Radio to me.

I had assumed the windmills were just from besige. But you're right more likely Valkyrie chronicles.

Transistor was from the radio. Since the picture is just an artwork featuring different components, so have to ignore the art-style. But JetSet Radio intrigues since it's the same publisher as Valkyrie Conronicles.

I've updated my guess

I keep seeing people say Transistor, but I don't get it? The boom box? That looks like Lethal League or Jet Set Radio to me.

I think it's because some people seem to be hung up on the term 'transistor radio', even though it is an antiquated one. Transistors have a lot more modern uses these days, not the least of which is acting as the horsepower of the CPU in the device that you are reading this on right now. Anyway, my previous thought was Inside My Radio, but I don't feel too confident about it. It seems like a pretty vague clue.

The Transistor guess comes from the sword pictured in the video, check post 1. It doesn't seem very likely to me, but hey.

It's almost here! Honestly I am just curious if Transistor will be in the bundle or not.

A friend of mine shared ths in his activity feed. I was thinking, more people should see this, so I asked for his permission to spread it around. So here, community, MakoSipper's manifesto:

If you're wondering if you should get Humble Bundle's Monhtly Bundle, I say you probably shouldn't. A few reasons:
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• Only 5% goes to charity, as opposed to their standard 15%, which are customizable. So it's a not-so-Humble Bundle. Note that 5% is $ 0.60.
• They say "Discover games that haven't been featured in other bundles.". They probably mean "on Humble Bundle", which is not only misleading, but will open grounds for tons of repeats.
• Subscription is a treacherous way of making you forget you'll pay for it on each month, and since they give no refunds for this one, you'll be pretty much screwed and probably curse yourself a few times for not cancelling it.
• They count on people's FOMO (Fear Of Missing Out) to make profit. Don't give in to FOMO! You'll probably regret it. $12 is a steep price for a bundle, especially when you don't know what you're buying. Don't worry, you'll have other opportunities of getting the games. The bet is just to risky to be worth it.
• First month's list is probably the following: Valkyria Chronicles, Besieged, Rogue Legacy, Transistor, Saint's Row IV and Legend of Grimrock 2. While it's not a bad list, remember that some of these have been bundled before, that you may also own at least a few of those, and, most importantly, their first monthly bundle should be one of their best, since they'll try to convince non-buyers that they've missed on a great deal. Just don't give in. You're better than that.
• Buying bundles when you know the games is the way to go. Even HB has some great bundles, like their recent Capcom one. Remember that you might purchase the $1 tier when you're not sure about the BTA (Beat The Average) games AND when the average is still low (for example, when it's $4), and only later, after you've confirmed the other BTA games and that they're interesting to you, you raise how much you pay to beat the average from the time when you payed the $1 (ie, if the average raised to $6 after the new games have been revealed, you still will only have to beat the average of $4--as per the example--from the time you paid the $1).
  .
  So basically HB is doing a dick business move that's not humble at all. So I can think of only two factors that might make this HBM worth it for you:
  .
• You live in UK and your Steam Store currency is in pounds (but that weighs only a tiny bit)
• You're only starting to build you Steam library and have around one or two hundred games tops, and most of them are really crappy indie games from other bundles
  .
  But, seriously, DO YOU WANNA SUPPORT A DICK MOVE? What's the message it's gonna send to bundle websites?
  .
  Anyway, some people have asked me about it over the last week, and I hope this sheds some light on this matter for those who are wondering if they should do it or not. ;)

Where is our Transistor?

No Transistor :c

I hoped for Transistor, but I have only Saints Row from this bundle. So I guess it didn't hit me as bad as others.

Huh. I was thinking about buying this mostly because of the Transistor guess but I was never convinced it would actually be in the bundle. I definitely won't be ever subscribing to this now. :x