Wow, this is a really interesting implementation of a modular weapon system.
It feels very dynamic but I was never really sure what difference the colored weapons made, outside of opening the doors.
I loved that combining the multi nodes created different weapon configurations. Didn't realize until after the boss that I could pretty much make a super cannon with the right ordering!
The boss design was a solid combination of the other elements of the game, cumulating into the final fight. A boss health bar element would be nice addition, I couldn't get close enough to see how far along I was.
The music, art, and SFX all blend to create a really cool cosmic brain environment.
Great work!