Took a quick look at the WIP. Looking good so far. Well, the title screen does not look so good because it seems to be image reduced to (32?) colors.
There are some bugs. No need to mention them I guess because I'm sure you're already aware of them...
Sometimes your weapon go through the enemies so they can't be killed. That happens quite often.
Also it seems to be a delay when jumping. I press jump after a half a second he jumps. Maybe this is just my setup? Anyway, this is very early stage of the game and I'm sure these bugs will be sorted in the final version.