The idea of the game is good to change characters to help each other, but there are two bugs I found, the first is that even after getting all the keys I wouldn't go to the next level, and the second is that when I restarted the level the number of keys obtained was not zero, but you put the levels option, so you could play the other levels, the puzzles are well done, although some of them you have to get right the first time if you don't have to leave the level, just I think I could put a warning or text on level 1 saying that "Z" changes characters, I pressed several buttons to know which one has changed, this is your second gamejam, you did something very interesting, keep it up as you have potential, congratulations on the match.(Sorry if my English is bad, I'm Brazilian and I'm not fluent in English, so I'm using google translator)