Thanks for the feedback! I will work on fixing these and a few other small things following the completion of the jam voting period. Hope you had fun!
Thanks for the feedback! I was able to release a new version of the game today following the jam. It should address most of these issues, including the level 10 and 11 locks, no more enemies spawn when a boss is present, and a rapid fire upgrade for more variety and to make things more manageable. If you have any more feedback would love to hear it!