Fun game, but the pacing was a bit odd, the first two runs were fine but then it escalated very quickly with only the first three rebirth upgrades to where I was able to buy out the entire shop in minutes and then pretty much win instantly with hundreds of trillions of diamonds to spare. It felt like it was over way too quickly at that point.
On a minor note, the upgrade tooltips could be placed a bit differently as they cover up the cost of the upgrade while hovering on the buy button.