Update note - Free demo ver.0.3

1. Add Artifacts that can cause petrification, freezing, burning and other attribute effects on monsters. Players can get a variety of Artifacts in the level to build the effects.
2.And now, players can permanently grow players' attributes (weapon atk、critical hit rate、reload time、 magazine capacity、etc..) by consuming energy to reduce the difficulty of the game.
3.Add "Camp", where players can consume golds to buy weapons in the tomb.