There are absolutely some weaker levels in here. The absolute worst, in my opinion, is level 37. I literally do not know how that ended up in the game as there seems to be no thought at all behind that particular level design.
But the vast majority of these levels are brilliant. Level 33 and 44 are some of my favorites, but easily level 49 is the best. I was really confused for a long time and then my mind exploded when I found the solution to this level. I can never describe the immense feeling of joy I got when completing level 49. I think this level in particular is so brilliant that one can only think of you as a proper genius. Even in spite of the unexplainable existence of level 37.
Disregarding the unfortunate bug that everyone ran into, only 1 extremely minor things did annoy me and that is the shadows. They are all wrong. Look at the shadow of one of those shooty things. The triangle and the rectangle that the thing consists of, each cast their own individual shadow, which obviously should not be the case. For an otherwise polished game, it's really weird to see you go wrong on the shadows.
Obviously, I would still consider Planet Lander to be your best work, but this one comes actually very close to beating it. Thank you letting us experience this glorious game!