If I can say anything about this game, it's very minimalistic. The music is good, sound effects are nice, and the graphics are quite fine. The particles give a nice spark around the game every time the player jumps. However, I hate to say this, but it's pretty boring. It's just another side scroller platformer game. Not saying it's a bad thing, but there's no innovative to it. Sure, there's the time limit where the player needs to beat the game in under 15 seconds, wall jumping, and a toggler to switch which platform is active or not. The time limit is only effective if the game isn't too difficult or too long. I'm having struggles in level 4 because of how difficult it was just trying to reach to the final destination. It was too short for just beating it in under 15 seconds. Wall jumping is fine, but it's nothing innovative at all. The toggler isn't something brand new as well since it has existed in Super Mario Bros.
The last thing I would complain is the difficulty controlling the player. The jumping mechanic is the annoying part. I'm being honest here, but it's not very responsive. A coyote jump or jump buffering can make the game feels better and smoother. The ability for the player to jump higher is also annoying since it feels like the player has to force pressing the space button longer to reach a higher height, but the falling is so slow. Maybe make the player to fall faster just to ease them in their journey.
Overall, you did a solid well to submit this game. Really cool and it was quite alright. Could've been better, but good job. Hope to see you improve.