Graphical bug
This game is a pretty average, overall enjoyable game for when you need to kill some time, however, I'm experiencing a bug that every half a minute this white rectangle that stretches across the screen will appear (or if it's already there it moves up slightly). When it moves up, it takes the upgrades and GUI with it, moving the GUI above the graphic. It will continue doing this until it reaches the top, moving in around 5 cm increments. When it gets closer to the top it covers the GUI at the top and renders it impossible to see. When it reaches the top and eventually disappears, the upgrades do not come back and you have to close and reopen the game to get them to come back, only for it to happen a minute or so afterwards. I don't understand what this bug is but it makes it frustrating to play, rendering it impossible once the upgrades have left the screen. I hope a patch comes out because it's starting to really agitate me. Other than that, the game is great.