Cut/Changed content in A Koopa's revenge 2

This is a list of Objects/enemies/content that was removed or changed in one way or another in A Koopa's Revenge 2.

From Gameplay footages

A Koopa's Revenge 2 Gameplay Montage

The Whale sprite's less large and the X is near his teeth.
The Shroompoint's helmet has a brighter red.
In 2-2 after baby Mario, there is only one yellow block instead of 3.
Also in 2-2, the night time background is different showing only a dark blue sky.
Also in 2-2, the blocks near the first star coin are different
the cave background is different
Koopa's crouching's sprite is quite different
Apparently, The Koopalings were supposed to be locked in Bubbles (pretty much like when the Koopalings are replaced with 1-ups when you unlock them) instead of stars.
there are a few spooky versions of a few enemies in a ghost house level
the map looks quite different
The red switch palace has some differences: there are only 2 non-ground blocks and they're bright blue and there are no note blocks.

A Koopa's Revenge 2, Official Gameplay Footage

The footage shows only unedited gameplay of 1-3 "'Shrooms Tops"

The icons for completed levels are only yellow and for not completed levels, we have a black icon with a red M
Near the first star coin, there's a message box.
There's no music except for when the level is finished
Instead of a Super Mario World goal sign, there's a Flagpole (like in Super Mario Bros).

A Koopa's Revenge 2 Gameplay 3

The Fungi beetles' top is light blue instead of green.
In 1-2, the level's a bit different after the first falling platform with fewer ground blocks and two Fungi beetles on the ground blocks
In the training level, In the room where you can change your character, instead of doors there are pipes: green for Koopa, blue for Goomba, and orange for an upcoming character (in the final game, Shyguy).

A Koopa's Revenge 2 Underwater Gameplay

The footage shows only unedited gameplay of 3-1 "Razor Reef"

The checkpoint flag still has the letter K for Koopa
Goomba's small sprite is different.
Goomba's Water flower sprite is different as well.
the level ends with a flagpole just like in the 1-3 gameplay footage. This might prove that in the beta, all the levels would have a flagpole as an end sign.

A Koopa's Revenge 2, First Boss

The footage shows only the unedited gameplay of fighting the first boss of the game Popmo.

Popmo's sprite has no mouth and has a more bright purple.

It doesn't Jump as his main movement. instead, it walks normally
You can't hit it with fireballs
in his rowling state, it follows the player like a Koopaling fight from New Super Mario Bros Wii/U.
It takes only 3 hits to beat.

A Koopa's Revenge 2 Demo

The video is a gameplay of a demo of A Koopa's Revenge 2.

This demo's very small and it only has one level: the one that would turn into "Baby Steps"

The Level's music is a Super Mario World Overworld Theme Remix.
The level itself is quite different by the content of question mark blocks and objects placements.
The only baby implemented in the demo is Baby Mario
If you wait for a few seconds, baby Mario can look at the player
when you kill enemies, they still have eyes and they can blink
The checkpoint flag is definitely very different than the final one. it has 3 colors: black, yellow and green.
The Piranha Plants are also different and they look like the ghost version of the piranha plant but smaller.
The Hud's quite different as well. Showing the P speed meter up instead of down and there's no box to contain your Item yet.

From Screenshots

while in development, Lambta.co uploaded on Newgrounds a few news about the game in development. some of this news actually have screenshots to look at!

Most of the screenshots look familiar but the last one shows a difference from the level 1-2. instead of the two Fungi Beetles there are two red toadlets.

Then there are these ones. The first screenshot seems to be an early world map and the second looks like another footage of an early/removed ghost house level.

Unused Level?

There's also this screenshot which seems to be a regular overworld level.

Homever, the hud doesn't show the baby score and there's no similar level to this one either.

So, perhaps, this could have been one of the very first levels developed or could also be an early version of the all powerups level.