Thanks for playing, and thanks for the feedback :)
You definitely have a reason to be disappointed I guess :/. To be honest, when I made Perlen, I ran low on time to submit for the AGBIC Jam and didn't assume anyone would care enough aboutPerlen to play through it twice, so I didn't prioritize the "payoff" for collecting all the crystals.
As of now, their only use is to take away the feeling of linearity in thel levels and to embrace exploring them.
I planned to add a new ending after submiting, but, you know, I just didn't happen to make it.
I'm sorry you weren't rewarded for collecting all the crystals, but I'm happy to hear you felt invested enough into the game to do so.