Haha thanks for the comment! We watched your stream and noticed a few things. Under normal circumstances, the bullets coming out of the Octorobot's arms should be much faster. Pressing L should kill Octorobot, all the playtesters confirmed this but for some reason it didn't work on your computer. So your stream was really valuable for us to address such issues :)
We also loved your energy!
For what is happening in the game, there are 3 types of enemies, 2 normal ones and 1 boss. If the normal ones have a purple colour, that means that when you kill them, they will drop a weapon that can be attached to an arm of the Octorobot. The goal is to kill as many purple enemies as you can to grow the Octorobot's arms as long as possible!
Again thank you for your comment and including us in your stream! Also, we are glad that you enjoyed Octorobot :)