Played this single-player as Axl, and just posting a couple thoughts and observations.
-Just a minor thing but the start menu still says V3
-There's a minor naming inconsistency; Axl's Stoneman weapon is called "Stone Rifle" on the weapon get screen, but Diveman calls it "Stone Cannon". Based on what it does my guess is that it's the latter.
-There's a pretty big singleplayer bug regarding the white color scheme that gives you copyshot. If you try and load a save where you are White Axl, you get the message:
"EXPECTED TO EXTRACT AN OBJECT OF TYPE 'INVENTORY'.
FOUND ONE OF TYPE 'COPYSHOT' INSTEAD."
And the game won't progress beyond the console. Loading a save when you were standard Axl still works and the armor was unlocked for use in Cossack's lab but any time I died using the White Armor it gave that message when it tried to load the autosave.
-I have no idea how I did it but I apparently completely screwed up Cutman's stage one run. I had an autosave that would autocrash Zandronum if you loaded it, the screw turret things in the ground couldn't shoot, and the helicopter dudes spawned almost constantly. Thankfully the shotgun worked well on them. Oddly enough, I went back in to Cut after getting Axl's capsule to try it out and the enemies worked fine.
-I one-shot Toadman with Nuclear Fission. Is it just that powerful or was his old weakness not removed?
-Weapon thoughts:
*Cutman's cutter sniper thing (Hereby referred to as "Blade Sniper")-Holy hell this thing is powerful, and as long as the room isn't gigantic or the wall a horizon, the return time isn't that much. The ability to one-shot Joes at a distance accurately and quickly is big.
*Freeze ray- the only thing I found this effective on was the birds in Toadman and Toad himself (though Nuclear fission blows it out of the water on that point). Joes seemed to be dealt with better by Nuclear Fission/Blade Sniper/Stone Cannon and weak guys never grouped up enough that the Autopistol or Shotgun didn't work just as well. Then again, it was my 5th weapon I got.
*Needle Shotgun-Good at taking down smaller targets that you can get close to, works on larger ones as well if you either have room to move or a wall to hide behind to pump.
*Nuclear Fission- Point at problem, click, problem goes away unless its a boss.
*Water Pistol- While it was the 6th weapon I got, like Freeze Ray I never really used it due to other weapons working just as well.
*Stone Cannon- Kind of clunky but powerful, it one-shots Joes. Kind of annoying if you accidentally ricochet the rock and it traps you. Also doesn't work if you are too close to a wall, the rock will break immediately in that case.
*Copystuff- Didn't get to play around much with it but it seems goofy and cool
*Starter Autopistol- Never loses use, useful in pretty much any situation.
-The only big annoyances I had with the new enemies were the Turret Joes in Blizzard since their shots were so damn fast and the octopus dudes in blizzard also cause their homing missiles seem either impossible or extremely hard to dodge without hiding behind a wall.
-I have no real opinion on Blizzard himself cause I nuked him in a second and a half with nuclear fission haha.
-The only thing about Stoneman that I noticed was that most of the time his Power Stones didn't do anything cause they'd crash against a wall before getting remotely close to me. Might be worth it to modify those so they actually become a threat. Otherwise thought he was okay, stone hands and all.
Saftey spoilers if someone doesn't want to know anything regarding capsule locations
-I found the location of the one in Heat but I tried hitting the cracked wall with a ton of weapons and nothing happened. Do you need something like one of X's weapons specifically or something?
-Did I miss a visual tell to the location of the capsule in Toad? You get the hint that one is in toad in the hub but I had to run around with noclip to finally spot the damn entrance in the waterfall.
-Is it me or is Iceman a little hard to fight? the arena is small, Ice Slasher hits like a truck, and if he gets close it seems like he is at least going to do a bit of scratch damage with the ice breath.
-Does Ice have a weakness? I was trying a bunch of other weapons until I tried spamming Blade Sniper and that worked wonders against him. Also a healthbar would be nice.
Overall was really fun. Axl is amazing to play as.