Cute art overall, I like the animal themes. I think a couple things that was missing aside from a little audio feedback was a good visual feedback of incrementing - if I wasn't hovering over a shiny when the game 'ticked' it wouldn't pick up, even if i was there for a little bit, i felt like having more skill at the game wuoldn't really let me get much more by way of shinies. Also, there should probably be a slightly better boundary where the shinies/pickups can spawn, they could occasionally spawn halfway (or maybe fully) under the ui on the left hand side.
Great job overall!