Game development ( To make a game)

I hope you're doing well. I've already completed most of the development for the game I'm working on, which is designed for a younger audience. However, I was hoping you could help refine and improve several aspects to enhance the overall experience.

Here are some key areas I'd appreciate your assistance with:

Performance Optimization & Playability

Please make any necessary adjustments to ensure the game runs smoothly and is fully playable, especially so children wont quit or get board instantly.
Visual & Aesthetic Improvements

I’d like the NPCs—particularly the ones that trigger running mechanics—to move more fluidly and have improved visual designs.
Overall, please enhance the visual appeal of the game to make it more attractive and engaging for players.
Boss Design & Battle Enhancements at the end and maybe also make the chasing NPC'S look different by adding a different look to them.

Please redesign the boss while retaining his current head—give him a fresh, more impressive appearance.
I'd also like the boss battle to be more engaging. For example, require players to collect or unlock a special item before they can fight him.
Add interactive combat mechanics that make the encounter feel more rewarding and dynamic. Just make it easy to understand but enjoyable.
Game Passes & Monetization

If possible, please incorporate some fun and fair game passes that offer optional content or perks without affecting core gameplay. But dont make it to monetised since that drives people away.
Gameplay Variety & Interactivity

Some parts of the game may feel repetitive (e.g., moving heads that go up and down and kill the player upon contact). If needed, feel free to revise or expand on these elements.
I’d really appreciate it if you could add more interactive, fun, and varied gameplay features to keep players engaged.
In short, my goal is to ensure the game is not only functional but also fun, visually appealing, and engaging for its intended audience. I trust your judgment and creativity in making any changes that would support that vision.

Thank you in advance for your help!