For anyone who knows how to make water fill itself and make lava duplicate itself, I made a giant water/lava-exploiting obsidian foundry
Filled:
I can sit there collecting obsidian and have hundreds and hundreds by the time the tank is empty xD
Just in case anyone missed this on the bottom of the last page.
Also, I've built lava traps for zombies during the bloodmoon to keep my mansion's NPCs safe, friends and I constructed a boss-farming combat arena several times with evolutionary design upgrades, had great pvp fun with everyone on their own team in pvp mode against the skeleton and the eye boss at the same time (LAWL!!), built traps for friends to fall into and drown or fall into and burn to death or fall into and get ambushed by fireball-throwing furless rabbits in hell...
the list goes on and on. The game is a riot. Do some reading on what all you can build, get a couple friends together and you'll have a GREAT time.
Well worth the $5 or $9 or whatever it is
full price. Edit: Oh, and that's all without even covering all the cool stuff the devs said they're already planning and had originally planned to have already in-game at release if it wasn't for the sheer demand for its release.
The future of gaming is indy games.