Side-Scrolling Action Game Developer

I'm looking for an experienced game programmer to troubleshoot issues with NES 6502 assembly code base.
This is an action adventure game that is nearly complete and needs some engineering polish,

Key Requirements:
- Expertise in action game mechanics
- Proficiency in side-scrolling game design
- Experience with game development for PC, console, or mobile platforms

Ideal Skills and Experience:
- Strong programming skills (C++, Unity, or similar)
- Previous experience in game projects
- Ability to collaborate and integrate creative ideas

Here is a list of the issues
-player slides while crouching (should not move)
-screen tiles that contain pickups must not refresh on screen reentry
-boss rooms (5) must be gated to lock player in room until boss is destroyed
-ladders code needs adjusting (needs to lock on and release when entering/exiting ladder tiles)
-4 power ups need implementing
-increased attack range (update sprite and hit box)
-increase health (update hud and health)
-increase project damage (update sprite and damage)
-increase melee attack range (update sprite and hit box)
-implement start button map screen
-implement simple save system
-implement game over screen

I will provide level maps as well as detailed examples of the issues and the code as well. I will also pay the additional cost to obtain the editor required to edit these scripts (nesmaker)

This is a short adventure 90 min and it can be played from start to finish at present.