I've made a number of visual changes since the version of the game I posted gifs of originally. For one, to make it obvious that you aren't supposed to touch the floor after jumping on an enemy, the whole floor sparks up with electricity, reserving the "red light" effect for when you get eliminated. Also, there are borders on the map (which I had to manually do, since the incorporating fists as sprites means I couldn't auto/alt map it). I'll probably keep the minimalist black tileset as an unlockable or something.
I also streamlined the HUD, so that you only see the time in the upper corner, and the lives/coins only show up when you lose or get them respectively. My maps play pretty close to the edges, so it was either re-do all the maps, change the whole game's resolution, or make the HUD as unobtrusive as possible, and I went with the latter.