The overall smoothness of the game, including the visuals and design, is pretty good. Other reviews have also mentioned one issue: the game is a bit too difficult. The hitbox of the spike traps is too large, the corners of the jumping platforms often get the player stuck, and there are some problems with the jump height as well.
One especially important point is that the game really needs checkpoints!!! Over the past few days I’ve been spending almost an hour each day playing, and many times, after struggling to get all the way to near the end, I died and got sent straight back to the starting point. That feeling is truly devastating.
I don’t even know how many times I’ve slammed my desk just trying to beat this game — it’s the only game that’s managed to tilt me this hard. If you could reduce the number of traps, or rearrange their placement, and add more checkpoints, this game would become really great.