At least I'm glad to hear the difficulty will receive a nerf.
Same, the difficulty is absurd when playing it solo, primarily due the fact that the stock buster seems to do very little damage (Special mention goes to the Bass Buster), as well as enemies seemly everywhere, sometimes even by checkpoints! (Such as in Elec Man's stage where
several Thunder Lords attack you as soon as you respawn) Also, I swear the level designers
really like Sniper Joes, as they seem to be scattered throughout loads of levels, and Ice Man... good lord...
Another thing I forgot to mention, I am kind of against switches in MM8BDM mods since the main game doesn't use any and players may not have a bind for them. It's why I used those switches you jump on in the first place. Consider maybe using the "player bumps" action instead for switches. That's just me though, totally up to you guys.
Perhaps you could have, say, a "switch" enemy which you just shoot to activate. Perhaps it could use the sprites by the Buebeam things.