How about old dtv, with a similar gold/exp system to the current one?
With gold/minute ticks, there would be abusers, so how about it's defend the village, and you get a certain amount of gold/exp per wave? (once all the npc's are dead)
If it's once the npc's are dead, this wouldn't assist glitchers in any real way (unless archers).
As for the gold system, I suggest:
- End of round/wave
- Time is no constraint on the reward mechanism
- Players alive at the end doesn't alter gold gained.
- It would make sense, that those who don't die get more, as the "loot pool" or rewards would be shared amongst fewer. (bad idea, promotes self-sufficiency instead of teamwork)
But the old DTV shits on the current one, and was actually fun.