The idea is fun but the game lacks replayability. When you finish your first level you won't be motivated to play on. Maybe you could add new levels with new bosses to play to keep the game fresh! You could also add upgrades to bosses to make them even more stronger!
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Thank you for your comment!
I thought the same as you, but I hadn't time to implement a new boss or a new movement/attacks for the player as the game progresses, but I ensure the player gets stronger as you kill them, so it has a little bit of replayability. Also I implemented an upgrade system, but you have to die to the player to get it, so maybe some people might not see it.