Thanks for the feedback! As for the bugs:
1: As you predicted, I noticed this. It's a side effect of the fact that I completely reset each level when you die, and I didn't see it as a problem. I never thought of making the coins vanish once collected though. Nice idea.
2: The link to the picture isn't working, so I can't pass judgement here. If you can get it up and running however, I can take a look.
3: This bug infuriates me. Long story short, I'm too good at the game. When I playtested all of the levels, I was so good that I never died. As a result, I never thought of this bug until after the deadline, when I saw someone else playing the game. And the fix would have been so simple too! This is just another example why you should always have others playtest before you publish a final build.
Overall, this game was about as fun to make as it is to play. Thanks for the feedback!