"Tower of Guns is a fast paced first-person-shooter for the twitch gamer... with a few roguelike-ish-y elements to keep it fresh with each playthrough. Think of it like FTL or Binding of Isaac mixed with Doom 2." - Taken from the IndieGameStand page
What's really awesome about this, though, is that you can get the game (currently in Alpha, and updates are sent out to any who purchase the game) for as low as 25 cents! You won't want to, though, because if you spend at least $1 you'll get a key when it's released on Steam (the game is greenlit)! AND if you beat the average (which is currently $1.49), you'll get the soundtrack, a ToG wallpaper pack and even an eBook by developer Joe Mirabello - The Armpit of Evil, a full 258-paged novel that looks hilarious! If you go for $10 or more, you'll also get Full Bore, which I reviewed and enjoyed (plus I'm doing a giveaway of through November 21st!) and whatever game is put on IndieGameStand next. Finally, if you're one of the top 10 contributors (which currently requires $10.01 to make, but I'm sure will get higher) you'll also get original hand-drawn art from the game!
Even without having played the game myself yet, I can confidently say that the game is worth the bare minimum of 25 cents, although I'd absolutely go for beating the minimum at least since you get so much more for it! Heck, the eBook alone is worth $2.99! Do yourself a favor and go get this one immediately, the special ends the 19th of November and then you'll be stuck paying the regular (and I can at least say it appears to be worth it thus far) $9.50 for it without all the super awesome bonuses!