not so good, screw up a level and ya cant replay it, why dont you do it like gemcraft, you can redo a level but only get credit for the part you did better, like 1st try 500, 2nd 600, you get 50 thingys the first time and 10 the second try.
i had 4 fighters, 2 of them could level up in the hut till strength 20, 1 of them they said they didnt trained that type of monster (or something like that) and at the other one, with strength 15, they said he couldnt be trained anyfurther, i dont know if that are bugs but i post them anyway