Finally made it!
To be honest: I had to add some additional checkpoints, so that I was able to save after every difficult part. The main problem of the level is, that you'll run out of coins almost certainly. After this happened to me at the melting obstacle, I additionally added a shortcut door from the beginning of the level to this place. Say whatever you want, but I think it is hard enough to beat the obstacles, so I count my attempts as finished
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The design of the level is simple, but well made and the obstacles are really creative. Well done! With the additional checkpoints it also didn't get too frustrating and I spent 1-2 hours, only doing this "one last try" until I finally "beat" it.