- Dupe bag.
- Sleeping bag glitch through foundation.
- House harassment. (1. That someone else can place ceiling in your house and prevent access to high floors. 2. You need to place 2-3 foundations around your house and put pillars everywhere and 2-3 higher than the floors in the house - waste of time instead of start getting fun)
- Servers lags too much. All this cheap hostings makes poor picture of the game…
Not so important:
- Loading lags of buildings - huge lags when lots of big houses built close to each other.
- Door permission.
This should be top priority before steam launch. There is already low population on servers because of this problems and without new players it will be worse.