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Hello, one-person development studio "WEST SUN".

I interested in horror contents. and virgin ghost is a familiar character in Korea.

I started developing that "How about making a virgin ghost the main character of the game?"

This game was developed by mixing the feelings of the 2D platform genre in the 90s.

I would appreciate it if you could enjoy the 2D platformer genre game where the cute virgin ghost is the main character.

Since it's a game made by oneself, there may be a bug.

I would appreciate it if you could report the fatal bug by e-mail.

Thank you.



One dark day...

A strong lightning strike a shabby tomb hard.

Due to the unknown cause, a ghost in the form of a woman appears in the tomb, but

virgin ghost suffer without remembering anything.

Someone found a virgin ghost in a house nearby,

The game begins as the virgin ghost notices it and enters the house.

Why did the main character become a ghost?

Let's go on a mysterious journey to find out who did it!


Hide System

Luna, a virgin ghost, can hide slightly as a "hide".(not completely)

and It can stun state the other person for a while or pass through the body.

However, most people drink strange water, can see the existence of the ghost Luna.

Hiding is useless for animals.

Certain obstacles can be passed as 'hide' state.

Bump as 'hide' state at humans enemy.

The human enemy in stun state for a moment and the attack is valid.

Bosses have strong energy and cannot give them a state of stun, but they pass through the body as they are.

Instead, if you continue to attack, they can be stun state, so aim for that time.


Sight System

Luna hasn't been long since she became a ghost, so can only see humans her closely without lighting.

However, raising your ability widens the scope of seeing humans.

but, she can see animals regardless of sight range.



Collect souls, and raise your ability.


- The offense gradually increases, and the energy flies to the end.


- The extent to which human enemies can be seen increases. (Including human bosses)


- It becomes easier to control the movement of slippery ghosts.

Hiding time

- Hiding time increases.

Recover Hiding

- The recovery time for hiding ability is reduced.

Flying time

- Flying becomes possible, and flying time increases.

Recover Flying

- The recovery time of flying ability is reduced.


Stage progress

At the beginning of the stage, check the yellow key's image on the hint sign.

Find the key on the stage.

You can't throw away the key once you get it.

Yellow keys may have fake ones, so check them out in detail.

If the key you checked matches the key you found, obtain it.

The red key doesn't have a fake.

If you find it, get it right away.

Enter the next step using the right yellow key.

If a fake key is used, you will receive a penalty.

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It has already been well received by visitors who participated in offline events of indie games in Korea as a PC version, and this Nintendo Switch potting will collect feedback from players at the time and present it with a more complete appearance.

'UNDEMON' depicts an adventure that unfolds by manipulating 'Luna', a ghost who suffered an unjust death, and is an action game that stimulates the desire for challenge and the unique feel of the 2D platformer genre.

Players can enjoy unique fun through the game's progression and combat using the 'hidng system', various 'gimmicks' that exist in each level, and the puzzle element of 'finding the key'.


1  Hiding system

■ Hiding system

The main character 'Luna' can use 'hiding', which allows her to slightly hide her appearance, and when she collides with a brainwashed human while in 'hiding' mode, she can give a brief stun to make the attack effective.Alternatively, some special obstacles can be overcome without difficulty using 'hiding'.

2  Unique boss battle

■ Unique boss battle

Boss battles are fought in a different way than existing human battles.Because the bosses are so strong, you can only pass through their bodies using 'hiding', and you have to fight unique battles that become easier only when you understand the bosses' attack patterns.

3  Finding the Key

■ Finding the Key

You need to find the right key that each level requires.There is a penalty for obtaining the same type of key or using the wrong key, so you must research carefully when obtaining the key.

4  Develop abilities

■ Develop abilities

You can increase Luna's abilities with the 'souls' collected through adventure, which is a great help in the adventure.

5  Various modes

■ Various modes

Normal difficulty as well as the original mode at the time of release. And there is even a special mode that is unlocked when you clear it!

UNDEMON will hold a 60% discount event.

UNDEMON will hold a 60% discount event.


This time, UNDEMON will hold a 60% discount event.




Added new mode, analog input, languages!!!!!!!!!!!!!!!!!!!!

Sell UNDEMON at a 60% discount.

Sell UNDEMON at a 60% discount.


The 2D platformer game UNDEMON is sold at a 60% discount.

Released UNDEMON on Steam

Released UNDEMON on Steam


Finally, you can purchase undemon as Early Access from Steam.

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Undemon demo en

Undemon demo en


Hello, this is the experience version of UNDEMON. You can simply enjoy UNDEMON. Thank you for your interest in this game.

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