Game Icons

Game Icons as well as thumbnails and promotional materials are explained here.

Game Icon
The Icon had simple old red text above a black and white mask. There was a gray void for a background.

Thumbnails
There were old thumbnails prior to the ones added in Version 1.0.1. They were all rendered in studio instead of in game screenshots. The first one had no light but it is the spawn room of the Storage Unit. The second was a shot of the Crate Room, looking at the broken crate from afar. This time the headlight's light is simulated here. The third one focuses on the exit with another light being cast upon it.

Game Icon
The game icon here was similar to the original, except Evil Spirit replaced the Mask and was looking at the camera directly. There was also the Glamorous Spirit, at the time of release a new character, teased by peeking at the right side. The text was also shrunk and the font was changed. The background was also much darker and had a red tint to it.

Thumbnails
The thumbnails, unlike the originals were in game screenshots. The first was just a shot of a key spawned next to three crates. The second was a shot of the exit door. The third was a shot of the Evil Spirit and at the time new Electric Spirit. The fourth and final one shows Mr Corpse peeking around a corner, starting to tint the screen red, in the hall with the "Please come back..." text.

Trivia

 * The mask that appeared in the original game icon is still in game.
 * The 1.0.0 Game Icon is used for the donation badges
 * The Pedestal, an old decor or scrapped mechanic, can be seen in 1.0.0's 2nd thumbnail.
 * All the thumbnails in 1.0.1 shows the camera man having no keys.
 * The thumbnails for 1.0.1 were apparently still taken in studio as the resolution has almost the same width as the height.
 * This causes abnormal stretching in the thumbnail preview of the real game.
 * There is a thumbnail where the creator photoshopped a phone over Evil Spirit for the "Playing ASU on my phone" video.
 * This is counted as it comes directly from the creator, but it is not mainly featureASU Phone Thumbnail.png
 * It is unknown why only Glamorous Spirit was teased in the 1.0.1 update icon, as two more characters, Electric Spirit and Mr Corpse were added.
 * Although the two characters in question are instead seen in the last two game thumbnails, so this may be why.