I had more fun with this then with typical "ball combiner" games, mostly because there was more strategy to it. I did wish the items were about 50-100% larger, some it was hard to tell what they were. Otherwise, everything worked as I expected and I had fun.
I think a cool way to expand would be the cookieclicker route with lots of upgrades you can buy (larger tank, double drop items, store one item for later etc.).
Viewing post in Fusion Fling (Demo) jam comments
Thank you for playing. Some of the balls are tied to some stuff for their size, but I think the coin could be a little bigger, due to the animation it has. I think it could be cool to add upgrades in the future with a second screen to go to to see the upgrades. I'll 100% think about it and see how things go before adding it, since it would require adding a bit for it to work well and to maintain some sort of game balance.