Initially I had written about running into numerous input delay or detection issues. After some investigating, I may have discovered the root of the problem. In the options you can change the size of the input areas (arrows) and I increased it by 30%. I decided to go back to default and noticed a significant improvement on my score.
For example my previous score on Can Can (8) was 344PP, 50P, 8G, 4G, 2B, 0M.
After reverting to default it is now 352PP, 55P, 1G
Not ideal solution for people with big hands, but at least this makes the game playable. There still might be that occasional hit wonder, but it is much more rare now.
When updating this review, I was going to bump my rating from 3/5 to 4/5. There is still no retry and the load times are a little long.
However the base game is such a great value for free and nothing is locked behind a hard paywall. So many classic songs are available to start with.
They also offer ways to earn the in game currencies through daily challenges, watching optional ads, or just by playing normally.
I love Pump so much and did not want to give up on this app. So I will go ahead and give it a 5/5 based on the positive and on faith they have improvements in the future.