I don't know the code to input to get the 50th crystal and once I get Macbat in the final world I don't know where to go in order to fight the boss. Help please?

Game looks great but achievements would make it even better

One thing I loathe about modern 3D collect-a-thon plattformers is that you can basically sequence break the whole level-design easily. My recent offender here is "Hell Pie" you can double jump + dash + swing up to 5 times, spin-attack + climbing on wall surfaces. Verticality or precision means nothing anymore with such an overpowered moveset, sure you might be fast and everything is fluid, but it also feels like i'm playing the game in Minecraft creative mode and just fly from one collectible to another,...

I'm one gem short on level 8 and I've went thru the level twice. not sure where to find it. I've gotten the one of the airship, submarine, building, cave and the 5th one. I'm missing the 6th gem.

I was searching around that desert level for like half an hour just trying to find the last crystal, I think it's the standees??