Hej, thanks a lot for the feedback!
You're absolutely right the first level was our biggest weak spot. We never quite managed to communicate the mechanics clearly, and I can see how that would lead to frustration. This was our first game jam, and honestly the first game of ours that anyone outside our team has ever played. After staring at it for days, we gone completely blind to how it reads with fresh eyes.
Thanks for sticking with it and taking the time to write this up, really valuable for us.