This game was not that bad. I think its main flaw was that it was not detailed well. It did have good animation when you died. Not a good idea to make yourself want to die, I guess. The music was really pretty good in this. I didn't even mind that there were no sound effects.
I suggest you putting in more detail. The difficulty seemed enough. Don't make the lava just red water. Hmm, Salad Fingers reference? I can see why most people consider this mediocre.