Very good game
Graphics aren't that awesome, but they still are original. 8/10
Style is very nice, I specifically like the desert-mode-thingy. 9/10
Sound is nice too, a bit repetitive after a while, but still OK. 7/10
Violence is moderate, not too much - after all, it's about trading, not robber-hunting - but it still has it's share. 6/10
Interactivity is good - it's a game, what did you expect. 10/10
Humour is also present, in my opinion, I always laugh when some robbers try and attack me. 2/10
Just one final question though, what exactely can you do with XP?