Golly! You perfectly captured the limitation while keeping the game quite hard! My best run was lvl 5, 1,33 min left and I didn't quite see the score because of explosion lol. Even with chain reactions its very hard to keep up with the swarm. It's charming to see it's a family project btw :) Great job!
Viewing post in Super Cute Slime Attack jam comments
Yeah, it has that. It also has Sorting Layers, in which you can assign a renderer to a specific layer to control draw order. On top of that, Order in Layer lets you further refine rendering within the same sorting layer.
I already put particle effects in a sorting layer behind the UI element, so I suspect something else is misconfigured; possibly a parent object or another renderer higher up in the hierarchy.