Game Demo of Miner Open Chests has been released on itch.io store.  (link) Welcome to download and try the demo. 

Miner Open Chests is a indie platformer mixed with action, puzzle and collecting. You can use various tools to break barriers,  find your way through maze-like levels by solving puzzles and operating mechanics to find treasures.  An interesting pixel mode can change all the picture to pixel style. So you can experience the feeling of 1990s' classic games, like Mario Bros. 28 various levels bring you more than 16 hours leisure time.

steam link