I bought a couple $10 indie games I've had my eye on for several months. Both were discounted to $2.50:
Harvest: Massive Encounter
http://store.steampowered.com/app/15400/?snr=1_4_4__13
Hinterland
http://store.steampowered.com/app/17140/?snr=1_5_9__13
Both games are a little rough around the edges (Hinterland moreso), but both play around with genre conventions in neat ways, and feel pretty experimental and fresh (again Hinterland moreso). So... I can't give either one a "ZOMG BUY" recommendation, but after playing around with them, I'm glad I finally have them both in my library, and they'll both be getting more playtime this summer.
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Hinterland marries very simplistic action-RPG combat with fast-paced, on-the-fly town building. You start with a small home base. You earn gold by defeating monsters. This gold can be spent to build homes for various visitors that wander through, allowing them to move-in permanently. The visitors that wander through are random, so you have to "make due" with whoever comes by. Each new citizen provides a benefit. Getting an innkeeper creates an inn, which generates extra gold and allows for more visitors. Farmers feed citizens. Craftsmen make weapons and armor, etc. The town upgrading has a nice feel to it because there's never enough G to do everything you want. Upgrade your farm, or hire that undertaker? Etc.
The game's downfall is that the combat is VERY basic. It is literally holding down the mouse button, and nothing more. Hold it down until the enemy is dead. If your life bar is dropping faster, run away. If the game's combat system was even marginally better, with some actual spells and skills, like a lightweight Torchlight, Hinterland would have potential to be a truly great, indie GotY experience. But alas, it isn't. Still fun, though.
Harvest: Massive Encounter I've had my eye on because a couple years ago I got hooked on a flash game called The Space Game. I was OBSESSED with it. I then found out it was basically a clone of Harvest (for shame, Casual Collective).
But... after playing Harvest a bit tonight, I've learned that The Space Game is actually a clone that improves on its inspiration. That game has an actual single player mission tree, and more tower upgrade options. Harvest does not. It's really just a handful of maps, each playable in a handful of open-ended game modes.
Still, it's a very fun formula. It's hard to believe resource management / base building can be distilled into something so simple and yet still be compelling. But it is! I'll be putting more time into this one, too. Just with it had a story mode.