Cave story is a casual game.
It must have been played by millions by now.
Eye candies:

This post contains SPOILERS. the entire post has SPOILERS! Skip it if you want to try yourself. Or if you are like me who doesn't care about spoilers, read on.

I have played all three endings and feel my soul have been upgraded.

The story is extremely simple, but the provoke ideas requires lot of thinking.

The fate of irony isn't really hard to grasp. During the game, there are a few moment worth remembering. The death of Toroko and King. King who tried to defend his village ultimately failed. Quote had to kill Toroko even that who he tried to save. Irony of fate.

Are there anything important about memory should be learned from this work?

Memory is history in personal level. When someone else knows the history, they can exploit it.

Doctor convinced some Mimigas to work so they can fend of something in the future that could be the recurrence of the past, but they are actually leading themselves to their doom.

The main protagonist Quote is a robot who lost it's memory and got entangled to stop the Doctor, and never regained his memory back.

After Curly Brace recovered from her memory loss, Cthulthu said he liked her without the memory better. Strange. Does this means anything?

Why are Curly and Quote, two robots seems so human, they need air, they can eat and they also have emotions. Are their emotions created by having memories?

There are times where people scream when their hard disk fail and all their data are lost. They often say all those important memories are gone with it.
So humans have that many important memories they want to remember, but their brain is not capable to store that much. Is it true that some memories are made to forget?

Humans are just shells, like Curly and Quote. Memory is what really defines a person.

If one can change his own memory, would he? As some memory can make him the person he wants to be, but also means he ceased to exist to himself.

Why is this game called cave story when the island is actually floating in air?
Because Quote started in a cave, and end up in caves until he finally found out it is not a cave during middle of the game. That's my opinion...
The ending is quite a happy one.