Thanks for your comment, it really (!) means a lot. Especially since this was my first jam & my first game. I've compiled a list of feedback - maybe I've got time to revisit in the future and improve it a bit.
In the mean time: If you've got some time and are willing to check out another one, here is my second submission: Every degree matters (for Sim Jam, theme: A Matter of Degrees). It's not as polished and complete as I would like it to be, but (I think) it turned out with a quite interesting take on the theme :)