I was just a bit unsure of what to do when I was playing this game. You can zoom out from board game world to the party, and can see these three other dice sitting there, but you cant seem to do anything with them? And I wasn't sure what the reason was for being able to see them and their numbers.
The map is big and there didn't seem to be a lot of enemies. The first time I tried it I didn't find any, and quit out of disinterest. My first attempt was just trying to figure out what to do: I summoned a die right on one of the red mats and thought to match the roll to the number on the mat, but that didn't do anything. Then I thought maybe the little black square above where you spawn was a hole? So I thought maybe I'd knock the die into the hole to bring it to party world or something...
There should be enemies kind of close to where the player spawns so that they know that's the objective. And I think having a screen at the start of the game explaing a bit more about what your objective is in general with the die, and explaination on how you progress would be helpful. I did find it fun to move around, he's very fast but it was fun to just glide around the room for a bit. And his little kick and slide are both charming. I only tried it again because attacking enemies was a part of the game description. I couldn't figure out how to attack and just got killed :p
A game over and restart / quit screen would be good too. You just have to x out of the game yourself if you die.
And since using your mouse in game is part of the mechanics I think a visible mouse cursor in game would be helpful.