I have played the beta for around at least 3 days because i got lucky to get one at august 8 
Made 2 character, a swordsman and an archer
Game is really good, needs a few tweaks, like maybe a better party system and invitation to make fighting boss better , also tweak the Monsters lvl and hp and exp
If u solo, boss lvl should be low at least,
If u go fight boss as a party, then boss lvl can be high and better reward
How about u give 2 keys next time? 1 for the main one who registered in the main TOS website
And the other one they can giveaway
This is what they did to Dota 2 back in beta to let more people try it out and test it and they can play with their friends 
