Hey Ofihombre,
What an achievement! So much variety in this gem of a game. I feel like the controls during 3D sections could be a little tighter, but the 2D sections are perfect! It would also be cool if your rankings showed under the level numbers maybe? Or are they displayed somewhere in the menus? Would be helpful for those that may want to 100% the game. The music really matches the vibe of the game. This game is very charming, you should be very proud of what you've accomplished.
BTW I chose your game as my Gem of the Stream!
I streamed my playthrough of the game. Check it out: