Here's a very early link to my start - I'll continue to update this itch.io hosted version until the jam ends... Please feel free to comment and suggest some ideas during the 20+ days remaining.
https://itch.io/jam/alchemy-jam-7/rate/4154591
P.S. The idea would have been towards a maze/puzzle type isometric world where you find different bomb types that will either 'blow up a wall' to open a passage to another area, 'burn' down a door, or perhaps even freeze water to allow you to cross paths. Ideally I'll be using the Bomb of course, as well as the other past theme icons that are suitable ( fire, key, etc )
The idea is now something close to that but will continue to evolve. For now, it's a maze-type puzzle platformer that incorporates.
Bomb, Fire, Feather and Key.