Growtopia has mechanics similar to mario. We can double jump like Mario, so why not add Goombas that we can jump on to kill. It's not a hard mechanic to add and it can add a little bit of spice to the game. And the Goombas can drop gold which can be spent on the Adventure Store which sells you stuff. Or they can even drop monster hides which can be crafted into a new item.

Integrating parkour into PvE like Mario would be amazing. Fire Piranha Plants are in Mario but we already have Cybots with a similar mechanic.

Just a thought.