This is a really cool proof-of-concept and the presentation is top-notch. Right now, the gameplay feels a bit lackluster, though. Like, I can feel there's a great game in there, it just doesn't quite click with me yet.
I think I have two main gripes with this game:
1. The dicebuilding aspect doesn't feel relevant. The levels don't really seem to get a lot harder over time and I feel like you could probably currently easily complete the game with your starting dice. Which also means there's not much point in collecting gold.
2. The gameplay itself feels too dependent on the dice you roll. Yeah, sure, that's the theme of the game, but it just feels like it takes a bit too much control from the player.
I think for the first point, a steeper difficulty curve would help. For the second point, I'm not quite sure. Maybe try to play with dice values or something? Or maybe even small things like not having to land exactly on the level exit and having 2-tile wide passages would help, I don't know.
Also, minor point to note, teleport dice are not strictly better than movement dice, as you can't collect coins and the key on the way.
Anyway, I'd love to see where this concept could be taken with more time!