Thank for playing and taking the time to write some feedback!
Your first point is certaintly something that might be added in the future, this game has a heavy influence from Slay the Spire, and we know a good amount of its mechanics are probably aplicable here as well (not all tho!).
About your other suggestions, I do agree the current set of dice is somewhat limiting when you want to give your deck some complexity, and with that I mean playing with external factors like the amount of energy you have, dice that can return to your hand, discarding unwanted dice, etc... but I can tell you the next update will be focus partly on trying to fix this, there's many new mechanics that we hope will make the deck-building aspect of the game more enjoyable :)