It's awesome you made this, it is to be celebrated. I've a couple of first impressions:
The visuals are trying to be too complex, to really pull off this style at this level of detail I think you'll need some really good artists. Maybe try for your next game to find a more simple, pleasing style which can look pro even though the level of detail is less. A recent game to do this well is Thomas Was Alone which you can find on Steam.
It looks like a Mario clone, there's so many of these. I'm making a platformer and I'm trying to be as far away from Mario as possible just to force myself so find interesting design solutions to gameplay. I've spent a lot of time looking at Knytt Stories, Sound Shapes, Stealth Bastard and a whole bunch of others to find a new language for platformer design which is more contempoary than what we had in the 8 / 16 bit era.