Thanks so much for updating those achievement names on Steam so quickly, I really appreciate it!
While playing, I noticed one more bug with the upgrades. For the "Battle Hardened" upgrade, the description states that you are supposed to go back 5 waves from your previous max. However, whenever it triggers, it actually sends me back 10 waves instead.
Also, I noticed one other thing regarding performance. When I have the game open in the background while doing something else like playing another game it starts to lag quite a bit. Would it be possible to add a feature or setting that ensures the game allocates resources properly or runs smoothly even when it's minimized or unfocused? Just wanted to let you know so you can take a look at it alongside the other fixes.