This is cool for a prototype but needs a lot more development for a sustainable game loop.
- Numbers need to have an impact beyond "bigger == better".
- Some numbers could be linked in pairs.
- Extending that, while breaking with the visually cool concept of card snippets, I think having something that increases (and/or lowers) multiple stats could make building a card much more interesting.
- Battles (or a future relic mechanic) could come with modifiers that prevent you from playing certain numbers based on your or the enemy's last turn(s).
- Powers could interact more with numbers
- HP need to grow in order to foster more interaction.
- Having a character die after 1 turn should be a deliberate (or desperate) choice, not the default for anyone without damage resistance.
- Likewise, the only alternative to damage resistance is being able to oneshot multiple enemies, who lack HP as well.
- Against bosses/elites, both HP and turns are basically irrelevant and only damage matters.