I loved playing this game back when flash was still up and running, and I'm happy that this was brought back. Managed to get 62 shine sprites and 63 star coins, but unfortunately I had to shave off 1 point from my initial rating due to a persisting game bug.
Every time I get to the last boss with Bowser, the game glitches out, Mario is stuck in the air and I'm unable to do anything. I went through the final level three times just to make sure, and it ends the exact same way each time.
It sucks. I beat the game 100% long ago here and I hoped I was able to do the same, but I came close and now this bug is preventing me and everyone else from getting the whole way through. Definitely a Ruffle emulation glitch, whether or not this can be rectified, I'm not sure.
Consider this a warning if you're revisiting or getting into this game for the first time.