I would really advise in investigating this concept further! It is pretty cool. Very nice especially for a game jam. Could be a chill game for travelling. Here are some of my thoughts:
- Its pretty cool that you can see what shapes the coins have, that way you have a puzzle aspect
- The modifiers are pretty cool. I want more during a run :D (I used the bomb modifier and It made all my chain reactions way cooler)
- Quick Thinking seems kind of op as it cost nothing and makes your good cards easily accessible
- Please make things rotatable by right click. I was sitting on my couch with my laptop 5m away connected to a tv and this hurt my feelings :D
The coolest thing by far was to make the biggest bomb dragon ladder whatever chain reaction. Maybe you could reward players an extra coin if they find 3 coins with one bubble, so that they are encouraged to do risky plays.
All in all, very nice game and very well executed. I must be honest, I am 10% mad because I had a vision of a chain reaction deckbuilder but couldnt quite design what I wanted. You did it very well. Cheers.