A very well produced, fun game with trippy graphics and cute voice-overs! I obtained the power of Earth by 'killing' the green dragon, but got stuck at that point as I couldn't find an exit.
The card combat system is a bold choice, as it makes for a steep learning curve within a game jam. However, it has a well implement UI and also help features. So, it's good that you're pushing the boundaries for mechanics in this type of game. I also like that you can buy new better cards and upgrade existing cards; the progression in fire power is good.
The game ran well in Firefox. I have a low spec machine but there were no performance issues at all. The game seems well put together, technically speaking.
Thanks for helping to organize the jam!