I really like this game because how unique and how you took the twist of the theme! Great job and impressive for a jam. Good Luck!
Some feedback (constructive):
Right now, we can see that your game is great. That's not the problem. Its just that people are not playing it because it is at the bottom at the list. So comparing your games image to others, we can see a big deference her. Many games that at the top have colorful images that display the games uniqueness and pulls you in as well as many games having custom cover art. I think that taking the time to make a custom cover art in a studio such as piskel would raise you very much. Try to make a colorful, vivid image that describes and encapsulates the main idea of your game.
Another thing to note to make you game more popular would be to lighten up the colors. Your game has great game play, but it is accompanied with dull colors. This describes a garden well, however maybe you could encouragement pink for flowers or yellow for daises in the garden instead of just brown, dark green and grey.
I really like how you made the shop incorporated with the game and how you stop to do the shop. I think that you maybe could expand on this as I was wishing their was more in the shop. This could be the main seller point of your game.
Another thing to note is that as Acropolise said, I wish their were shooting FX for sure.
I think that maybe you could incorporate the instructions on how to play a little more clear, as in making it a tutorial scene. This would make the game more user friendly and at the end more fun.
I noted that when I was playing I was able to go off the screen in the top. Little bug, probably can be fixed in a jiffy.
Also, I found it almost impossible to actually get the minerals, because I would always break it open but not hit it again to harvest the gold lump inside of it. However, after a while, I started to memorize the map and was able to move around with ease. I think that to make this game TRULY endless you should make it so that it is a randomly generated map with constraints to not make it impossible.
Thank you for reading my feedback. Once again, great game and impressive for a jam. Keep me posted on updates! Good Luck!!!