After killing Tails,
Knuckles and Robotinik,
he has another target:
Mario, and SONIC.EXE
created a portal to
Mushroom Kingdom !!
The portal opened in
front of the castle of
Peach, and the most
dangerous killer of the
universe: SONIC. EXE,
came capture Mario! Now
the Peach need to save
him from death!
Although a cool concept, I think the levels should have more sonic assets, from what I see peach is exploring mario worlds, The title is Peach vs Sonic.exe so you should have sonic themed levels as well.
In this reply I am only going to name the parts you need to fix, but I am going to see the rest is pretty good.
1. The title screen music is extremely unfitting
2. In the second level after the pipe part where there is a dark sky, but it still uses Panel de Pon music still.. I think you should use a darker track.
3. The story in the intro was unchanged from a earlier version it says "Mario and Luigi were captured and Peach has to save them..."
4. "Death Zone" I think is not that good of a name, so you should probably give it a better name.
5. There are few cases of cutoff but most are pretty minor but if you can fix them, fix them...
Other than that you are on a good start, although it has no real relation to the creepy pasta it is named after, I hope the creepy pasta aspect becomes more dominant in later versions or worlds.
ForthRightMC, the Sonic.exe is the sonic opposite, he killed all who lived in green hill, now wants to kill sonic.exe peach and Yoshi, and opened a portal in mushroom kingdom and captured the now Mario must save them from death !