Everything you say is very valid, and I whole-heartedly agree with you. In fact, the designer of this app truly doesn't understand the philosophy of choosing colors.
Being minimalistic is a bad idea when you don't know what you're doing. For example, there are reasons why a link is in blue and 'call-to-action' buttons are in red (like the 'Compose' button, as in Gmail). The purpose of red is to let the user know its something 'important'. The designer of this app in question chooses to ignore these UX concepts and seems to choose beauty and aesthetics over these fundamentals and over-uses the red color (even his navbar is in full red..duh). And that's truly a bad sign for someone wanting to show themselves/their products as professional, especially when the selling point IS the UX.
Being minimalistic is a bad idea when you don't know what you're doing. For example, there are reasons why a link is in blue and 'call-to-action' buttons are in red (like the 'Compose' button, as in Gmail). The purpose of red is to let the user know its something 'important'. The designer of this app in question chooses to ignore these UX concepts and seems to choose beauty and aesthetics over these fundamentals and over-uses the red color (even his navbar is in full red..duh). And that's truly a bad sign for someone wanting to show themselves/their products as professional, especially when the selling point IS the UX.