Gacha text elements are hidden behind the shop buttons. Screen can't be resized to fix this (you can enable this under Edit->Project Settings->Player).

Gameplay is a bit too simple to bother noting, however I should point out that your Per Second upgrade gets relatively cheaper as time goes on. The cost is always equal to 2 seconds worth of DPS + $10, so each successive upgrade can be bought a few microseconds cheaper than the last. Typically you want upgrades to take longer to upgrade the further along the are, with upgrades that provide linear benefits requiring quadratic resources to buy.