Haha the ending and game design was so rushed at end, i can't even explain, lost all motivation at end because i have never ever made horror game, densku3, the artist did an awesome job with art though,
An overview of plot by the way - A war broke out between machines and humans, and machines started to get a upper hand and started hunting down humans. Humans chose to morph into frogs (frogs symbolizes tranformation and adaptation in many culture) the player is currently going through frog tranformation, so thats why she is having "hallucinations" which is portrayed as world changing. (should have added more effect to showcase it).
At end, player is given choice to either stay frog and hide which is safer but losing of identity, and be human and fight back, thats why when you choose to be human at end, a door opening sound is played which indicates other survivors opening bunker to save the character. Should have been more clear with the ending, but its fine the way it is, it was cool experience :D