I think it's not that the platformer itself is too hard, its the lack of proper introduction and tutorial of the mechanics. I had no troubles with the controls themselves, as you can see I finished my own game here (took me 40 minutes tho)
I am working right now mainly fixing the design including proper introduction and more simpler levels at the start. I will publish the updated version when it's ready. I have a lot of ideas on this game that I want to implement, so stay tuned!