Game is very simple and it works quite well.
I liked how background changes when you go higher, nice touch.
Not exactly the most creative game, but oh well.
As for the things that might improve your game i would add a variable jump so that player has more options on how they can utilize the main mechanic of the game.
Add obstacle that you need to dodge.
And add different dies that do different things, like a die which has 6 different abilites. (high jump, dash, screen clear, game speed increase, game speed decrease, etc)
Given this was made in only 48 hours you might not had time to implement all of it.
And here's my highscore : )
