For now lets ignore the fact that it was inspired from Meat Boy. As a game, it's capable of holding some replay value (which is important for most games), if you dont mind the small monotony of the graphics and song and what not. There are 2 things i believe would make this better:
1) Add the ability to control the player with the WASD control scheme (where W= Up, S=Down, A=Left, & D=Right) "along" with the arrow control scheme. This way People with those different preferences can play the game comfortably.
2) Edit the wall jumping mechanics. The reason why is because sometimes you can just be "by" the wall and start sliding when instead you want to drop down fast. That probably wouldnt be an issue if you could just "tap" the direction away from the wall and drop down, however, it seems you have to hold the opposing direction for a while to jump, which can be detrimental in the wrong situation. Perhaps you can just make it so that "tapping" in the direction opposing the wall makes you drop from the wall. Also, if you want to, make it so that you dont activate the wall slide until you press direction going towards the wall (or make this an enable/disable option in the option/settings). Since you kinda float anyway this would allow you to get close to the wall without sliding perhaps.
On a side note, i like the fact that you didnt make it so that "touching" the side of the spikes doesnt harm you. Hate stuff that pulls that NES logic on me.. lulz.
[Some After Thoughts: Notice how you float when you jump and move? If possible (and if you want to, of course), perhaps you can make slider that adjusts how much you float in game.]