BR3
I managed to be extremely lucky and get a time of 1:37:20
Creature: If he does machine gun attack, you should kill him with holding UP before his next attack. Your axe should dmg him and destroy all the bullets. And dash to leave this room!
@ 12 sec
Medusa: Dash the moment you enter the room and you should be able to avoid her gaze attack and summon medusa heads if she starts the attack with either of them. Again, hope she does the tail attack. If she starts off with the gaze attack, position youself so when you hold UP, you hit her while she transforms into a snakehead.
@ under 40 sec with optimal conditions
Mummy: Hope he does the 5 brick attack. If he does, just get hit by the first one and you should kill him before you get hit again!
@ under 1 min. Optimally, under 55 sec.
Ruler Sword room: Ok you got to be careful because if he does the horizontal swords when you reach the end corner, you need to throw an axe at the sword blocking the door and jump to kill the sword above you.
Werewolf: New strat. Stay away and throw axes. He should throw 2 lampposts (just get hit by them) and if youre out of grab range, he should summon wolves (go up to him and hold UP). You should get hit once and kill him soon after. Dash to leave room.
@ under 1:15 with optimal conditions
Death: The best thing to hope for is that he starts the spinning sickle attack ASAP. Just hold UP and try to dodge the sickle by backdashing (you will still hit him with the axe while backdashing!). Get to end by dashing!
EDIT:
BR1
New strat with balore: After you get hit by vertical punch, if you jump forward, youll recover and kill him before reach ground. You can kill him under 15 sec this way.
Also, when leaving Gergoth's room, double jump to exit.
I got a new time of 32:35 with these strats
EDIT 2:
Ok I finally got myself to record a BR1 video
http://youtube.com/watch?v=sakyMt0PjR4
Good: I managed to execute my jumps perfectly so when I entered rooms 1, 2 and 4, I did a mid-air Super Jump instead of landing then Super Jumping. Also I didnt realize I could just dodge Balore's vertical punch until this attempt. D:
Bad: Too slow to leave Gergoth's room.
I prefer to play BR without music.
Overall this is close to perfect as you can get and anything under 33 sec has to be considered excellent.
EDIT 3: How dumb can I get... If you backdash twice instead of getting hit by Gergoth, you can save 1 sec allowing you to get a time under 32 sec.
EDIT 4: Video. 31:37
http://www.youtube.com/watch?v=kxeYTZ-8Ex0
EDIT 5: Video. 30:31. P's tips when to throw axes cut 1 sec out of total time.
http://www.youtube.com/watch?v=WluOYiBy8eE
EDIT 6: I got a vid with the time 28:80 that will be hosted on this site with explanation of the strategy.