Well, accepting so many coins is definitely a good thing, but min bets are higher than in some other popular dice places! It's not a big deal, just noticing!
Multiple coins are always good because gamblers will have more options and more convenience for deposit and withdrawal. They don't have to convert their coins to a limited coins on the casino.
No conversion, they will save a bit transaction fee that is another thing they will do like.
The interface is simple indeed, too simple for my taste to be honest!
Dice game is simple and it does not require to have too complex UI.