We're very glad you enjoyed our game! Yes we are aware the game can be very unfair at times, listening to all the feedback I think some type of cue indicating the key change could be very helpful.
Regarding the 'fixed' version of the game we thought it would be a nice addition for anyone who enjoyed the original version, as it pretty much only fixed a particularly hidden bug that made the last encounter unbeatable. We're still new to game jams and we'd seen other submissions do similar things, and didn't think doing something like this would be against the rules, otherwise we would not have done it. We thought (and encourage) that teams will rate our game based solely on the original upload. We're sorry if it wasn't the right thing to do, but again, we didn't know it was something that was frowned upon.