Nice platformer!

That was short and sweet, very pretty visuals.

Neat little project - I used Gdevelop in my early ears (NOSTALGIA HITS HARD). Under no circumstances should you assign jump button as a W key  - most platform games have a dedicated jump button since the Super Mario Bros. "If it's working, don't fix it". Some technical feedback: 

• Add some eye frames (if exist, extend the duration of eyeframes)
• Proximity mine's hitbox is strange, cause can detect collision out of space (near the stairs -that is a rat move)
• (maybe a Gdevelop's problem) - SFX played with a delay - ~ 1s 
• Good thing to reuse assets, but change them a bit, if they have different actions (like different color of the sparks depending wheter their movement is horizontal or vertical, etc)
• add a "hold JUMP to JUMP higher" mechanic - then Player has more control over the character and it feels good + adds possibilites to YOU to build YOUR LEVELS differently (win/win/win)

Overall, good game - enjoyed playing, keep working )

I like this one, always enjoy a platformer. My one suggestion for future platformer builds though, replace the (Space=jump) with (W=Jump) unless you are building it that way to up the difficulty it is much easier on the hands to have all your 2D movement in the smallest space possible, it also makes the playability much smoother.