Click on your robot to check it's findings and recharge it's batteries. Use the explosives to unlock new things, mine in other mines, or even mine more explosives.
Your robot will take some time to find more items, but it will keep doing so even when the game is closed. You can close it and do something else, and once you are back you will have a bunch more waiting for you.
To interact with some objects in the game you will have to first select items from your inventory by clicking them.
Update: added tutorial pages to the game, and also made a bunch of small changes.