Hey, nice Game.
I like, how you merged the Mario Mechanics in a stealth game.
The levels are pretty boring designed and I would wish more Enemy types.
Marios Weapons are pretty overpowerd. Its okay, if you try a Speedrun. But
for a normal playtrough, you just have to wait for the refresh of the cooldown
and throw the enemies to death.
There is a bug, where the boxes wont open, when I jump under them. I have to
jump many times from multiple directions until it works - very annoying.
My personal Ideas:
A button to slow down Mario (he runs a little to fast for me), maybe with a noice-mechanic for better stealth-action.