Thank you for the feedback! Yeah, in initial stages the phase change was discrete rather than gradual, but it felt like I wasn't embracing continuous movement in the 4th dimension. However, for gameplay purposes it does seem like it would be a far better design. This went through several iterations and experiments, and I didn't test it with users so this is very valuable feedback. I think I'll update it and improve it even after the jam ends.
Viewing post in Journey Through the 4th Dimension jam comments
If you wanted to keep the continuous change an idea would be to make "close" colours act differently. Like if you were Orange, you could land on Orange platforms like usual, but you would fall through Red and Yellow like quicksand (giving you time to jump again and change to Orange), and all other colours were intangible like they are now.
Either way you want to go with it, let me know if you update it, I'd be happy to playtest,