It is a fun game! Nice job!
At first I thought that my copies were there to help me and digged my own grave with the bullet hell, nice!
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Hehe, that is a fun reaction. One thing about the echoes is that their bullets aren't supposed to collide with the central boss machine, but I guess that bug slipped through when I changed around some stuff with collision layers. That might have contributed to you feeling that they were helping, so sorry about that :P. Glad you thought it was fun!
I am planning to do a patch and add some more content in the future because I really like the aesthetic and raid-lite boss mechanics I implemented, and have always wanted to make a bullet hell for some time. It might take a bit because school starts up again soon, but stay tuned!