I'm having the same problem as the others with the big crystals, I think they aren't scrolling by quickly enough. (I have been holding down space to jump higher!) I'm pretty good at games like this usually, so I'm sure it's not a skill issue LMAO.
Also, I think the three new characters may not be in the download ver. of the game, as I'm not seeing them.
This is a really rad project, and I hope this isn't coming off as rude!