Good game, found some of it tricky, it's quite tough not controlling the character any more than the extreme limitations given, but it's definitely not unfair for most of it. I found the boss fight a little unfair though, as i was literally right where a spike ball spawned, and got obliterated; overall though, quite a fun game.
Only criticism i would give it is that the lack of music makes vast amounts of the game rather dull, i would maybe put some music in to raise the tension. I understand the original pong didn't have music, but this deviates enough that i think it could warrant it. Overall, looking forward to future projects man!