Hey, this was a nice short and sweet game! I'm always fond of these one-button platformers and how creative they can be in building a challenge around that limitation: this game felt pretty solid with a decent variety of mechanics like spikes, on/off blocks, and the ghost. I had a good time, finishing it with all coins collected (though it didn't give me the achievements because the login didn't work, oh well)!
It was nice, but I were to have some feedback, it'd be:
*There were some crazy difficulty spikes in the way the levels are sequenced, so I would've reordered them to make a better gradual curve. For example, level 8 is a big sudden step-up in challenge, only for level 9 and 10 to plummet down back into being incredibly easy tutorial-esque levels: level 8 totally should've came after them, or even later on in the game.
*Some of the early coin placement was a bit annoying, forcing you to have to rerun the entire course over, sometimes even twice in a row for three full runs. It's only a few instances, though, and for the early, easier levels, so it's not that bad: I just would've been annoyed if it kept doing it over and over.
