If you like games like Terraria, Stardew Valley and Starbound, then this game should also be on your list. It has 2D Graphics and it looks very similar to the games above. The developers say that you will be able to create your own machines and experiment.
Aim
Basically you need to complete quests in order to advance into the story. Things are randomly generated (seems to be common in these types of games).
Participate In Closed Alpha
All you need to is head out the official website of Mechanic Miner and subscribe to them with your e-mail. You should probably get access to the game whenever it’s ready to roll out to the closed alpha.