I'm deeply impressed by Anteworld. At first glance it looks almost perfect except single biome, no rivers and lakes, no weather and
not enough trees 
It looks ok in some mountain areas in Europe, but, it seems, there are very few trees on all flat-type terrain. For example, in central Russia or Siberia. There are many places with deep woods, but in Anteworld these places are covered by grassland with very few trees.