I just finished the bonus level with 500% health remaining after vir was gone, on normal difficulty (first time) and my wizard leveled up 8 levels. The only problem is that when I started a new game there was no additional skill points to be used. I noticed the same problem before on easy difficulty on a few games I completed but I was assuming I didn't get enough XP to level up, and it's not the case
Got a question though, how can you guys have the bonus time so long if vir cannot be, killed, slowed down or stunned? Once he reaches the end, it's done