I forgot about this demo! I've played Super Skeleman and Skelemania and I really enjoyed them. I used a controller to play. I like where this is going, but I also have some criticisms.
I had some trouble with lag and scrolling, even with a 2 GB graphics card. I like the art and music, but the mechanics and controls felt a bit off. Triggering backflips is a hair slower than I'd like, but I could get used to it again. I'm not a big fan of how the dive works. Conserving some momentum is cool, but this can also be abused to continually dive across long horizontal stretches. There is also no way to cancel or reduce the momentum of the dive. I don't remember if this was present in the previous games. The lack of a smooth transition between running and charging feels awkward, as I was expecting it to function like a regular run button. It's disappointing that it's impossible to dive after a running somersault jump and retain the running momentum. I figured out that you can get a huge damage boost from spikes if you jump at the right time. Is that intentional?