The 3D perspective maked it really hard to do platforming. But 3D platformers are super hard to make, so don't worry. Even developers of Celeste made not so good 3D platformer (https://maddymakesgamesinc.itch.io/celeste64) with same issues as this game.
It took me some time to know there is double jump, maybe mention it in game's page.
But the game had nice atmosphere and cute graphics.