I got to say that your game reminds me of a 2d stroller version of the classic arcade called Marble Madness. Here are a few suggestions based on playing your game. First add a score that records your movement and once you lose a life have the score restarts to “0” before rolling for more score. Next add 60 seconds time limit to collect 75 blue hearts and gem along with 6 more levels to create the stakes. I hope these suggestions would help improve your game.
Ok, no problem. I like the idea to mining coins with algorithm asic resistence, there are some projects like Masari and anothers that I would like the power of good software to mining. In your software I get 5 k/h on ownero (deprecated pool mining now) and in the generic XMRig only 1K/s on the major algorithms.