Thanks for the feedback ! :)
It is intentional as a discovery goal-free game so you are supposed to find by yourself. Yet I understand you because I didn't had suffisant time to make the experience as playable and enjoyable as originally planned.
I will make adjustment updates and bugfixes today and this week though :)
(Spoiler alert) gluons can bound to quarks if their color (or anti-color) match, then you can bind quark together if they are of pairing colors, then I stop there for the spoil and invite you to check Wikipedia on how a nucleon is made :)