I expected there to be a gimmick related to losing your coins or something when I read the title...
Anyway, this is quite easy to go through, but it doesn't look too different from the usual muncher jumps in gameplay. You could tone down the yellow a tad, since it's a bit strong on the eyes (and that also counts the glowing cement blocks). One could also confuse the brown blocks into solid blocks when they're not upon hitting the P-switch. The boss at the end wasn't much challenging than the rest of the level.
Having to listen to the piano music over and over isn't enjoyable. You could either change it to a far better one or not choose it on the music bypass setting.
The obstacles aren't very thoughtful all around, but know that your skills can improve a lot and practicing will get you there. Good luck.
That looks kind of strange, or is it just me?
I think you should rework this into a full chocolate hack. You could use a custom block that acts like a coin, but subtracts from your timer when you collect it. The goal could be to collect a certain number of coins while also balancing your time.