I just played your level. When i saw this post, I had to set up my Wii U. I haven't used it since 2015.....
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Anyway good first level! A remake of an official level is actually a good idea for a first level, it at least makes sure you don't put unfair shit in there (My first SMM1 level is horrendous what with a troll thwomp and a requirement to spin jump on it after your star wears off to get an extra star, otherwise you die through the pipe)