Not bad, interesting movements - through I find it annoying we can't change direction while jumping - could that be changed?
I specially appreciate the research for originality trying something different. Keep that up!! GL!

** INSTRUCTIONS: Collect green coins to fill the Fly-bar **
** ARROW KEYS TO MOVE (UP+UP = Double jump) **

The least I can give is points for effort, because this had more work put into it then a lot of games I've seen.
For me, starting the game had a bit of the delay. The jumping and falling mechanic is a bit out of control. I also ended up in the same spot as DerangedDom where I couldn't get out of this pit. I would rather have that be a cliff I fall off of instead of a misleading path that requires you to refresh the page. The graphics, also are a bit under par. The two black lines on the screen are actually slightly annoying, and a white background seems a bit plain for this type of game. I don't think it deserves 0 stars, as it is promising for a demo version. But it needs a lot of work for it to be a finished game.

its arrow keys to move lol

Bad tutorial, Obvious engine, Overall boring

The game shows some interesting mechanics like double jumping, running, flying; perhaps a wall jump ability would come in handy sometimes, too… but there's a MASSIVE hindrance of not being able to control your movement mid-air. Since this is a platformer and you jump a lot, it basically makes you unable to move properly 50 % of the time.
It doesn't help much that you claim we move using "WASD", but actually only arrow keys can be used. Also in this English version you kept the "Puntuación 35" instead of "Score: 35" and that text field probably shouldn't be selectable.
I didn't mention the graphics, since you probably plan to improve them anyway.
Good luck.