what are the 'start again' and 'stop the game forever' buttons in the top left for? the pause button is nice for if the player feels overwhelmed, but the other ones kinda just erase the progress? if it's possible, it would be nice to hide them.
Also i though i noticed cool detail about the earth - it is not exactly round, just like in real life, though irl it doesn't spin that way, so probably it would be better for it to be round?
also the heart texture is stretched, so pixels are not square like they should be, maybe find another heart icon, so it goes with the whole vector graphics theme.