What I got (might have repeats from you guys considering I'm not even checking lol):
General:
-The levels have a timer
-Title screen track is an arrange of the invincibility theme from the final game
-Two stages available only (Castle, Atlantis Temple)
-No map or intro screen
-Getting grey crystal ball items upgrade your subweapon to always do "item crashes", different from the final game where the Up + Subweapon button is available always for special attacks
-John's light whip attacks differently and extends like an yoyo
-Eric walks awkwardly with the spear
-Eric's spear spin doesn't spin at all, he simply moves it around
-Skull item causes bloody tears to play and stay at all times in all levels no matter what
-Game starts on easy by default
-BGM 09 is new
-BGM 08 (versailes palace) starts quite different
-BGM 07 (Iron Blue Intention) starts with a beat not present in the final one
-Dying as John causes him to turn into a skeleton
-The player can jump onto stairs but not from them like the final game
Stage 1 (Dracula's Castle ruins):
-Courtyard has a torch high up you need to use the axe to hit (also there is no subweapon here in the final version)
-Skeleton with rotating mace makes strange sound effect (something witnessed on another beta)
-Hellhound miniboss sprite completelly irrecognizable. His head appears to deteriorate as you hit it.
-Merman sprites also completelly different. Closely resemble more of a gill-man
-The single ghost seen on the merman room is not present here
-Moon background on castle keep looks unfinished/early. Just a flat boring white circle where the moon should be
Stage 2 (Atlantis Shrine):
-General Atlantis level much shorter
-Atlantis water magician miniboss is much weaker and does not lock the screen forcing you to fight it
-Other two armor minibosses after water magician not present
-Medusa Head sprites are very different. They also make an ugly face with a tongue out when they get close to you
-Enemy layout on the Atlantis level (giant statue with breakable head section) is completely different
-Drowning on Atlantis level is instakill
Other:
-Konami code on main menu conjures numbers that can be altered by pressing A and B and C. This is a level select code, also seen in another beta. With the code it IS possible to visit other levels, but only up to number 30. Below is where number 26 takes you for instance:
All levels I saw using this trick were corrupted... It playing "Discolored Wall" on them didn't help matters as it appeared I was navigating some hellish dimension beyond poor John Morris' comprehension
I'll be editing this most likely lol