Enjoyment - A rage platformer + a metroidvania is a cool idea. It might be cool if after you pass a section the fake tiles disappeared. Would help with back tracking n stuff.
Execution - Very good start! The character feels a bit heavy, but can be fixed with some tweaking.
Visuals - Nice pixel art! Making some more ground tiles would help it look less repetitive for sure.
Audio - I can't remember the sound much... (only foot steps?) this free sound maker is great for retro style games/proto types if you wanna add more. https://www.drpetter.se/project_sfxr.html
Metroidvania - The lore seems like an awesome idea for a Metroidvania!
Keep it up and good work! And please check out my game when you can :D