another picky review.
I had fun with the game, but I share many of the user's complaints.
*I realize that bosses cant hurt you when they're down, but some people may not realize that, so maybe have them flash during their down time, as well. (I realize you already did that with the Robot Masters.)
*Give them a life gauge. Some users may doubt they are doing damage to the boss. (i.e. drill robotnik is far too easy to bounce on, and therefore hard to tell if most your hits count.)
*disable right-click navigation. I found out that by right clicking you can skip to other bosses. Some players may use this to their advantage.
*For some reason, I cannot select Freeze man, though he is in a selectable league. (other than with the right-click cheat mentioned before.)
Other than that, you've designed a wonderful, challenging game with a plethora of opponents. Excellent work, and I hope this review was helpful.