While I disagree the game is too difficult (in fact, it does feel like 'aim, strafe, and hold down LMB' rather than fighting an actual enemy), I do agree the mining and movement is incredibly sluggish, as well as earning new weaponry through Research Points and such.
Viewing post in The Lab and Dungeons Demo comments
Thanks again for your comment!
Maybe I need to do a little more adjustments to the initial status of the robot, while maintaining the enjoyment of upgrades later. I'll do a few more tests.
As for the combat part, there are quite a variety of weapons later on and hopefully can improve the experience of combat to some extent. But I will keep seeking other fun mechanics to improve the game.