Hey this is awesome!! Brings a smile to my face.
Some things to say,
As other people have mentioned, your game has this simple to learn, hard to master idea. And with your ultra-simple approach to the theme with a ball and chain, you allow yourself room for polish and all in all, the game is pretty hilariously fun!
You've done well to added enemy variety to drastically change the flow of combat, and forcing the player to adapt having to switch gears instantaneously. Very well done!
Some caveats,
I think you would do well with an emergency bomb button, it gives the players a second chance, and is a recurring mechanic in bullet hell games (your game has some of the bullet hell vibe). Do consider it.
Regardless, very fun! If you put in the work, give it some original art and music, I think you could make a pretty hilarious mobile game from this.