So happy you enjoyed it and made it to the boss! The intended solution to defeating the boss is to knock certain red cosmonauts into him with a fully charged shot. There absolutely was a bug that cause them to not spawn sometimes in the official submission upload, and we were only able to fix it after the submission deadline had ended. In accordance with the rules and recommendations, we didn't change the initial submission, but we did provide a link in the description where people can get the boss-fixed version. Hopefully you'll have an opportunity to try it! As far as the feedback on a more comprehensive tutorial and player-teaching, we completely agree! We packed a lot into the game and we certainly need to more time and space to adequately and incrementally explain it all to the player. Thanks again for the playing and the wonderful feedback! Your game is awesome too!