Thanks so much for this great feedback, it is very helpful. A lot of the small points I do agree with like no pause menu, the selection bug (I knew it existed but never got round to fixing it in time). You're right about texture filtering, I completely forgot about that setting. I've just tested it with nearest and it looks way better.
What you're saying about the gameplay is fair. The levels can be tricky sometimes if the setup wants to be evil but that's why you get the free bad kill every level. The levels are designed to be solvable with the free kill in mind so sometimes you can't get a perfect solve. I plan on working on this game a little more after the jam and will add more characters that don't just learn random info.
Again, really appreciate the detailed feedback! :) I didn't say in my comment on your game but your game is the best one I've played so far from this jam. Well done.