Another very well done game :D. The mining reminds me of Terraria. Had me googling what Materiel means XD, never heard of it before :D. (not native english speaking) Multiple key bindings are user friendly, which i really liked.
Also, I have some recommendations on QOL improvements to make the game even better:
- Mining upward (maybe it was a point to not have it idk, would be nice tho :D)
- Some icons for the top bars. I was a bit confused at the beginning what was what.
- Descriptions in the menu for the selected item, so the player knows what theyre buying/upgrading/selling
Had fun playing, good job!