Have at it, and let me know how bad it is.
License to nitpick accepted! Let me just post some screenshots...
Starting at the beginning, this guy up here is completely ineffectual, you should move him somewhere else, as it is, he just drops into the pit and poses no threat, I do like how you have just enough time to kill that bot and get off the platforms before they go though.
This platform kinda sucks, these spikes are also harmless unless you put something here to trick the player into jumping on them.
This room is just a clusterfuck of instant death and stun-locking, it sucks hard and you should redo it, I am also aware that you can use the kick to get over, which brings me to the next pic.
When the player lands on this platform using the kick attack, they get attacked by several enemies at once, this will most likely lead to cheap deaths as they careen over the edge trying to defend themselves until they learn to swap back to M.Buster quickly to dispatch them, easily fixed by redoing the layout of the previous bit.
This guy up here, his placement is kinda bad, there's also a 50/50 chance of him offscreening himself if he goes the other direction, making him pretty much harmless.
This one here (whatever it is), is in a bad position, its quite easy to blow it to hell before it can even launch an attack, you need to put it somewhere where it's harder to hit.
At first I thought this was too hard, and then I realized I have the wide-range buster-charge making these trivial to get to, you should make players work for these kinds of pickups by putting them somewhere that requires skill or risk to reach.
Last picture, the placement here is bad because it's too easy to knock a player into instant death here, giving the player more room to dodge might make this more fair, it's also painful to die right here inches from the checkpoint.
I also thought the boss arena was pretty bland compared to the rest of your level, the boss was also tough to beat with only the M.Buster
Heat Man's original layout is kinda lame when you look at it all laid out like this.http://www.nesmaps.com/maps/MegaMan2/MegaMan2HeatManMap.html