That was a pretty good, but it would be nice to have a little more option and influence over the roll.
As an example players can add or reduce the die roll by a saved up pool.
Each point the player takes a -modifier builds a pool
Each point in the pool can be spent to increase the result of the roll.
Might also offer some kind of random combat awards that can influence the pool to. A combat award bonus might offer +2 for 2 fights.
OF course I only played for a few minutes :D but it looks good :)