3) It says "rewards can stack" - does that mean we should be able to watch multiple videos to increase the duration of the skill
"Rewards can stack" means that you can watch a video that doubles your gold income by 2x, have a cat that increases it by 50%, as well as use the powerup that increases gold earned by 200% and all of their effects will combine. It also means that you do not need to chose a single video reward to watch, you can watch both video rewards and have both of their effects active at the same time.
I hope this answers your questions. If you have any more questions feel free to leave another comment or message me directly.
Hello michaelsmck, I am a developer on Tap Cats and I would like to answer some of the questions you asked.
1) When the countdown for the Auto Critical ran out, your cats stopped attacking.
This is definitely NOT intentional and I have filed a bug internally so we will look into it. Thank you
2) When the Auto Critical timer was up it said you had to wait 3.5 hours before getting it again
This is intentional. The Auto Critical video ad is a very powerful boost and we wanted to make sure that people were still participating with the game. We are still working on the balance for this, right now the duration is 30 minutes while the cooldown is 4 hours, but that may change in future versions.