Hey, thanks a lot for the detailed review!
I am glad that you enjoyed the art and the music. My artist did a fantastic job on the art and I'm glad that I got to work with them.
And thank you for the level design praise! I did indeed spend a good amount of time on the level design. Despite this being my first time designing platformer levels, I am glad the people seem to be enjoying the levels.
I must admit that I struggled a bit to get the control to where I want them. I thought that it would be easier to do the kind of air control I envisioned, however it seems that I must spend some more time on learning in that area.
The retry button not working is actually a bug which I will be fixing soon. It seems that I must've forgot to account for something on the web version. The retry button is working in all cases in the editor.
Glad you enjoyed the game :)