Here's a random suggestion for your Crazy Crossover Ideas, or two of them in fact!
Insaniquarium Deluxe, which I can give the fandom wiki for if you don't want to pay 5 euros (/equivalent) on Steam for it (it's a fun game tho)
And Emerald Tale, which has no wiki but I can get into my BFG account and get everything set up if needed (it's about Terraria's price on Big Fish Games)