I've played the game for a few minutes and I'll give a bit of feedback on it.
-Whenever Luigi hits an item block it doesn't make a sound.
-Every time I kill an enemy the item up above seems to flicker on and off.
-When I was riding on Yoshi, Luigi seems to always be in his goal pose. Is that suppose to happen?
Other than that this is a really good game. I can tell it's gonna be huge. The heart counter is a nice touch and I love the Milotic Easter Egg in the first level, especially when you hit the P Switch. Good Demo.
A 1UP may save your life one day.
Check me out on Youtube so you can see the many LPs I did on the rom hacks on this site! www.youtube.com/user/MarioBrotherL1UP