Awesome game, solid mechanics. I really enjoy the epic music and the awesome pixel art for the artifact.
Some suggestions for minor improvements:
- Some juice and polish would have been a nice addition. E.g. coloring the artifacts with a random color and adding some particle effects
- graying out buttons to indicate whether they can be clicked
- keep the game running in the background
- It would be nice to see what my chunks/second income is
Overall a nice and solid game that I really enjoyed!