I like it!
I do have a couple notes though:
the jump to get the coin on level 1 is too tight. it doesn't feel immediately clear if that jump is even possible, much less fun to pursue. It feels like a bug more than a feature
The chained spring jumps in level 4 are inconsistent and often just kill you. If you want them to be automatic, you should just program a path into them, or if you want there to be player skill involved you need to slow them down so the player has time to input something without it feeling like a crapshoot
Also, I get the distinct feeling this game was built for mobile, and if so I get why you didn't, but if you're going to have this playable on keyboard/controller the game would greatly benefit from having variable jump height depending on how long you hold the jump button. Always having to hit maximum jump height makes the game feel a bit stiff.
No notes on visuals and audio though. The art is fantastic, and the audio is great too. Good job!