I really love the idea behind this game, always a fan of multitasking. I did run into a bug (haha) where the dirt in front of a bug wouldn't disappear as it was digging. This meant I couldn't bring things back the way I came, as sometimes there wouldn't be a tunnel at all. It seemed to happen the most along the border of some texture, as I'd see straight lines and 90 degree corners where the digging stopped. Additionally, I was able to spawn one new worker for 10 dirt, but after that the button to spawn more disappeared, even though it seems like I was meant to have more than two workers. I got up to 66 dirt without the button reappearing, but maybe it wasn't dependent on that to begin with. Despite those problems, I still enjoyed the game!
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Yes, I already knew the bug but couldn't figure out a solution for it. It has to do with the transition of the unit between two tiles. When the unit moves too quickly, it cannot dig through the dirt of the new tile. However, when you trigger the transition again by moving back and forth it should work again. I actually intended the buy button to only appear when you are close to the base but didn't test it very well - could be another bug haha Glad you enjoyed it still! :)