Wow! Although having a few glitches I enjoyed the game a lot! It looks awesome :3
I think you should make spikes bigger, because in IWBTG they're bigger than The Kid, you should make The Kid faster and make him jump higher imo and fix the "not-animated" movement glitch (hold right and a few seconds later hold left and viceversa)
This game looks amazing ^^
You should post it in Kayin's forums