Not really as much of a bug, but due to gaining a random weapon at the beginning of the challenge, there are some levels that are impossible. I started with a bow, and was okay for a little bit. However, Upgrade Bot never gave me kick, and I eventually got to a level with a mk 3 sword bot, no traps, and no archers. Since I was only able to use the bow, I was unable to kill him. In a future update, when using random upgrades, could it be required that a player must have kick before a certain level? Additionally, I have noticed that sometimes Upgrade Bot will continually give me the same upgrade (clone 1, clone 2, clone 3, etc.), and this is very annoying. Is it a glitch or just bad luck?

it's possible, you have to shoot at the apex of the mk3s swing >:)

Mmm, this is not great. In the next update the chance of clones has been turned down when you already have one.

A tip for killing mk3 swordsman without kick is also friendly fire! Try running close to other enemies making them swing. Risky but possible

I have tried this, but the mk3 also swings quickly, and so when I have tried the mk3 killed the other robots instead of the other way around. Technically, all the levels are possible, just some of them can be very frustrating