I agree with others that this is a solid entry. It nails the fundamentals and has some nice extra things (e.g. the effects when you get power-ups). Controls felt a little weird on the keyboard but it was very nice on a gamepad (The jump is a little springy for my tastes but it works). Well done! My only real criticism is that I think the level design, aesthetics, music, and ending could be more interesting. The caves didn't have much variation and were a little dull to navigate after a while (though I appreciated the variation that was there). And of course, there's the useless bones (which bounced around nicely, however).