Very cool concept! Playing with any other letter to right-move was hard! It was a shame you didn't really need to go to the left, so that made things easier. Maybe a vertical level where you need to hop across platforms in a zig-zag pattern would have made you play carefully. That'd be interesting. Also, the camera was too close, made it difficult to see the spikes in time.
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Thanks,
There is a part in level 3 where I tried to have the player jump left and right,
I also tried to slow down the player and have him move back and forth with the spikes
I hoped knowing there could be spikes ahead would make the player briefly move left every second or two,
in order to not run too far ahead and to not completley stop either,
at least thats how I played most of the time.
I might have overdone it a bit with the spikes,