Apologies for short descriptions, might expand them when I've had some sleep.
So, for the fourth week, we're taking this in a different direction. Namely, rightwards.
By which I mean that week four is Hori week! Me and nasty are each responsible for about half the games picked out for this week. Turns out most freeware doujin shmup developers prefer verts.
Warmachine Overload

A hectic one where you have four weapon pods to customize.
Minishooter - RS Delta

See that "mini"? It seriously is. The playing field is small (and so is the window until you hit E, so do that), but that doesn't diminish its quality. A number of ships to unlock. Expect Normal difficulty for now.
Psyche Metal the Bleeding

A quite red game. Red character, red backgrounds, red... bullets? To solve this, rename the file BAKU.bmp in the game folder to something else, and BAKU01.bmp to BAKU.bmp, giving you far more visible pink and green bullets instead.
Galshell Blood Red Skies

So this one might be somewhat NSFW - some uncensored breasts and a little bit of gore, but I guess not much more than you'd see in a horror movie. The site linked to is SFW, but some other things from the same developer are less so, so I don't recommend clicking around on the site in decent company. Assuming you're ever in decent company.
Tumiki Fighters

And so well-known doujin dev Kenta Cho gets to be part of STGT Gaiden as well. In Tumiki Fighters, you catch fallen enemy ships to be part of your own craft.
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Team captain sends the vote, and to not get anything confusing this week, send the votes to only me, KennyMan666.
Deadline for getting your votes in is Tuesday, September 2nd, 23:59 UTC.