Cool game! The shrinking/ growing mechanic is definitely a pretty fun mechanic that could have a lot of potential if fleshed out more! The two issues I had with game was:
1. The physics felt a bit off, it seems like the character doesn't accelerate fast enough, which is especially apparent in the second level where you have to do a jump with a low ceiling
2. Since most of the time you want a specific result when throwing the dice, it was kind of tedious throwing the dice over and over again hoping for a good result. If you continue to develop it maybe you can make it so the longer you hold down before releasing the higher the number will be?