It's a pay-what-you-want game, so technically free., though donations are appreciated. The deluxe version, which comes with extra rules, goes for three dollars.

A shadowy corruption is spreading across this land. You, a stout-hearted Lumberjack (or Lumberjill) have decided to face the corruption head-on. Your only weapon? Your Trusty Axe.

Trusty Axe is a solo, one-page rogue-lite adventure where you wield an axe encrusted with magic gems against the undead hordes to cleanse a troubled land of corruption.

The standard, one-sheet edition is a pay-what-you-want game. 

The Deluxe Edition is three bucks and comes with 10 pages of different play modes and optional mods (including campaign play) that you can drop into your game for more fun and more replayability.

Link: https://ellie-valkyrie.itch.io/trusty-axe-solo-rogue-lite