So, update for 1.02, I didn't get any crashes, though I have not seen any jellyfish, either.
Balance with the salesman upgrade seems fine now. Even though I always focus that upgrade, it has never gone out of control like in 1.01. The boss is only a challenge if you try to avoid getting swallowed and there's no real benefit to doing that...
I don't really think forcing the first planet to be plains was necessary, but eh, it doesn't hurt, but did you make water planets harder? Now they always seem to have spiky likes and I have yet to successfully survive a water planet as second planet. Skill issue.
Now for something I consider an actual problem:
The rainbow pill. It's INSANELY laggy. I fire for one second and my FPS drop to 5 and the lag persists even when they are offscreen.