It is quite clunky, but a solid game. Quite a puzzling one, honestly. I think what could've been better is if the player doesn't have to jump or fall just to get the keys when they're close to the ground. Also, yes. The controls can improve and this game feels more focused on mobile phones rather than web games or PC. Overall, it's a good game.
(Btw, you can use this game to make profit as a hyper casual game if you like)