Ye, it was hard sometime to pick up dice becthe ause physics just became crazy and raft rolled over for no apparent reason. I also feel like you need to add some kind of tool for picking up dice, so player would interact with dice more clearly. For example a net or paddle would do.
I also felt a bit frustrated why my raft went down a few times when my parameters were fine (hp more than 80 and raft more than 50). I wonder if it was just crazy physics, or if there is some mechanics I didn't understand. Anyway, I found myself sinking a few times without any good reason :(
The core gameplay is fine for me. But I would add some icons to the dice, so the player can see what it will do to your raft or hp or something else. Like if this dice gonna give you +5% hp then you can add a heart icon to it (for example).
Visual is great too! Overall a good game!