You can still kick up and down if you position the cat correctly.
Actually the reason why the cat can only rotate on the x axis is that all I learnt to do were 2d platformers. I wanted to make this game without looking at tutorials but I had never made anything like that before. I think I did pretty well, but I couldn't really figure out how to make diagonals and stuff other than with a ton of 'if' statements to check what inputs are pressed (which is kinda bad)
Glad you found it cool :)