My 2016 science fiction / absurdist / slipstream novel Void is currently being promoted by eBookDaily.
The book is a dark, psychological rumination about the nature of reality, regrets and solitude. It's probably best suited to readers who are keen to be introspective about such things. Contrary to some reviews I've read, the book does provide an explanation for the main character's bizarre predicament. You just need to pick up on the clues.
Here's the link:
Follow the link to get the Kindle edition free from Amazon.