HOARD seems to be your typical sort of tower defense game, no?
I played the demo for hoard a bit last night and it's actually a casual fun little action game where you play as a dragon. Controls are simple sort of like geometry wars. WASD controls which direction you move, mouse controls where you are shooting your dragons breath. You fly around a map with towns and computer or player controlled dragons battling to collect the most gold before the round ends (looks like a 10 minute time limit per round). There's a bit more to it of course, but for the most part that's it.
You have the option of playing with 4 stats on your dragon and upgrading them as you like so each person could have a different playstyle. The 4 stats are Speed, Firepower, Carrying Capacity, and Armour. So you can make a slow lumbering tank or a quick glass cannon sort of character, ect. You won't be able to max all of the stats out in a single match. You get to upgrade those stats a little bit at a time as your dragon collects enough gold. Gold comes from raizing parts of the towns, burning up caravans, and burningup other stuff. you can make towns fear you and pay you tribute, there is a score multiplier to encourage you to stay alive, death isn't permanent just makes you fly back to your lair and regen all your health.
I Wasn't able to play a multiplayer match with the demo, it has a matchmaking option but I never was matched up with anyone when I waited for it to happen. Like many indie multiplayer games I'm afraid there won't be very many random people playing online, and the AI didn't seem to be good enough for sustained single player fun (I played the 2 quick tutorials then I think I won my first match 120,000 gold to 20,000 versus the computer dragon, lol). Maybe there are AI levels in the complete version I don't know.
Conclusion: I like it, I'd buy it at <5$, it's quick casual multiplayer fun, but it doesn't look like there is a ton to sustain single players. And you probably need friends with the game because I don't think very many random folks play it.