Very interesting game! at first I didn't quite understand the enemy behavior but when it started to make sense I really enjoyed the game. The jumping sound effect only worked during one of the stages, it was the one with all the platforms moving and you had to move upwards. Other than that, this was a nice take on the 2d platform genre :D
I don't know if you've heard of Game Development World Championship before (gdwc2019) but it's a competition for indie game developers where they can submit their games and it's free! It's great if you want some more visibility for the game and it only takes a couple of minutes to join :)