Hi! nice game. i understand its a prototype, but i would strongly suggest making some changes.
1. control over what sensitivity the player wants
2. better aiming function
3. proper GUI of settings
4. increase the walking speed of the player
Some bugs i found are
1. after you use all your balls to throw, it shows the option to return to screen, but you can still continue playing if you do not press the 'return to menu' and all those buttons
2. at level 4, when i got an upgrade option, i chose one upgrade but it did not work
Thank you for being such an excellent developer and making this game from scratch and i hope you continue to work on this project.