Sorry if I seemed too critical in the other thread. I think this game can totally pass as one of those feel-good classic type platformers. It has a very retro feel and look to it. With the color palette you have created i can see it drawing a specific kind of audience. Not sure if its your intent but it has a feeling that closely resembles games like:
Spyro The Dragon
TY The Tasmanian Tiger
All these games have something very similar in common that makes them quite fun to play and that is there is collectable items of some sort, scattered throughout the level and hidden in certain areas as well. Todd who worked on Fallout 3 and 4 said it best and that is to make sure your players always feels rewarded. I strongly recommend having items placed throughout your level, things like gems or alike that the player could collect. you can have them display as a HUD to show the player how many they have caught. Or maybe have a scripted event that occurs if the player collects a certain amount? Perhaps thats how they get past each level. I'm not sure how each of your stages end.
I was also reminded of another game, called Soul Reaver
In Soul Reaver the collectables are in the form of souls of which the player must absorb. Which are much more creative than just coins. But I think your game needs that extra something that the player can do that might help with its fun-factor and challenge.
While all these examples are quite old, the look you have created for your game is very retro and might resonate with some more nostalgic players. I can't really tell too much from the trailer alone, but it appears there isn't much for the player to do but go from point A to B. So I think throwing in some collectable items in there might help. Also not sure if you have any type of puzzles for the player to solve? Like doors and such?
Also I should mention... avoid using the font Comic Sans at all costs in your promotional material. Its greatly associated with unprofessionalism. Id say try to use a font-face that more so matches the theme of the game. Perhaps regular serif type fonts that look more medieval.
Though the color palette certainly doesn't match the vibriancy of your game lol so I think something more medieval cartoony might work.
That's my bit of advice. I'm not sure how far along you are with it?