Heey thank you so much for playing, yeah the bosses have a big HP bar above them to show you they are taking damage, besides the visual queues of the "bullets" impact :D but thanks again for the kind words and for taking the time to try it :D
Thanks:), I decided to lock-in and defeat the boss and i did it, The first boss had alot of health tho. But i did it, a fun game that was worth my time, good job.