I like it! It is very easy to realize how to play, your How to play section in the description makes it clear. Still, an In game tutorial might be interesting to see. If you do make one, that could be as simple as 2-3 "levels" before the center board that the player currently starts on, and those 2 levels could visually show how movement works to progress to a portal or stairs in the first level, teach the consequence of picking a red or green vial on the second level, and a third level could gives the player an optional chest to illustrate the collection of gold, but only if that is the initial goal of the game (I have not gotten far).
This has a lot of potential - continue experimenting!