Thank you so much for your feedback, I appreciate it!
Yeah, I budgeted some time for balancing the game, but apparently not enough. My first couple passes were way, way too easy - and then it took a pretty rapid turn towards way, way too hard. I eventually got to a point where it seemed challenging and thought that was good enough (since I didn't have any time left for it), but in retrospect I definitely see how it was much too difficult - especially since the hardest days are probably day 2 and 3, and that shouldn't be the case for sure.
Also, the cost for upgrades scales a little too quickly into the "completely unaffordable" range, so I should have adjusted that back down for sure.
Thanks again for taking the time to leave your feedback, I do really appreciate it! :)