This is fun-strating (?
A total challenge, dominating the jumping for not losing the combo was the best part, still, I totally suck at 3D platformers, but I had a great time finding the pattern of the coins for collecting, I'll be playing this further, since is that much fun.
Brogrammist is right, the only thing that isn't that much fun is that is far more easy to get out to the title screen for restarting, maybe a key that does that could avoid it to become that much frustrating, specially on precise jumping sections.