Ducking after jumping feels unresponsive. I know this is because the animation apparently hasn't ended yet, but I personally feel it isn't communicated properly. Aside from that, great game! Really enjoying the difficulty too!
We need a ton of stuff. First of all, (background) blocks with customizable hue. Second, the combat needs tweaking; hitboxes are too small. Really, in that respect, copy maplestory, including the spawning mechanics and pathing. Third, we need an increase on the coin cap -- the larger the file, the more coins available. Number four, the ability to import stuff from other levels into your new one. Fifth, more NPC types; the four we have right now are all "cityfolk", for lack of a better word. Six, we need more enemy variety. Seven, we need the other functions that have been teased already, such as developer level and such.
I think that's pretty much it. This coming from a game development student, I might not yet be as knowledgeable as the developers from Kongregate yet, but this is what I'd personally really like to see.
Also, badges.
Controls feel clunky, gameplay isn't all that interesting. I suppose I should give a heads up to the artist for sticking with the theme perfectly, but Papa Louie's artstyle never really appealed to me either way. In the sound category it does fine, but there's really too many different sounds mixed in. 3/5.