The idea is good, the game is well made, everything is fine except the rewarding system which is not working at all, let me explain: if you don't reward the player with something, he will not feel motivativated to go on. Yes, there are rewards: the upgrades. But the gap between a reward and the next one increase too much as you go on. As you get to 25k you have to wait until 50k for the next reward and as you get to 50k? you have to wait until 100k?! that's too much! that's 50k more! it took me a while to get to 50k and will still take me a while to get to 100k even with upgrades I got till here! You have to reward the player more frequently to make the game addictive! at 100k finally you get an upgrade to increase the amount of resources you extract, give that reward earlier so that the player see the score going up faster, reach the next reward faster, that's what make a game addictive. It's not like there is a lot of things to do in this game but that's fine if you make the game addictive, people will play it for hours. Sorry for the long response, just wanted to share my knowledge about addictivness of games. Leaving all this aside, the graphics and all are well made, well done!