Hey,
I would greatly appreciate your feedback on gameplay mechanics, level design, difficulty balance, visual/audio elements, and overall experience.
Overall the game feels pretty good. The physics are nice, graphics are cute and music fits.
Gameplay mechanics are nothing extraordinary, pretty standard stuff, but I like the bark mechanic. I think it should be used for more stuff other than the swapping platforms. Maybe you can bark at enemies to scare them etc. I'd also add a visual "shockwave" to indicate the distance the bark covers, imo it reads better than highlighting a platform when in range.
Speaking of the bark, if you bark while inside the swap platform the audio bugs for a second probably due to an overlap check. It only happens if the player manages to get stuck rather than get pushed out.
Level design seems fine, there's not too many levels yet so it's not that easy to judge. Do you plan on adding more verticality too, like a level where you climb a tower? The last level I assume is one of the harder levels because it's a decent jump in difficulty. Nothing too crazy though.
The one thing that really tripped me up is the controls. It seems you are team "space is for jump" but I am team "W/up is for jump". I think you should implement both (unless you have a good reason not to)