I’ve to say a lot so I’ll make a list:
Idea: How does it fit into the theme?
Art: Do I have to say something about the art… the animations are awfull! And why does the player not flip? Then the hearts are a bit bright, a more red-ish tone would be better. You can definitively improve here!
Audio: The soundeffects are really good but the music is annoying, mostly because it restarts every time you enter the next level or you die.
Gameplay: The controls are a bit… * meh* Anyway mostly it’s smooth, maybe a bit to smooth at some times. Collisions are fine.
Polishing: Post processing or a few effects(I think thats how it’s called in Construct), then screen shake particles could help to let it look polished
Originality: It’s a simple default platformer, so nothing special.
Then I’ll give you a few tutorials that helped me for good game feel and etc.
Art and animations:
And music:
And These about polish and game feel:
Hope I can help you improve. Can you play and rate my game too?