There is a wealth of design material at the company's website which you've essentially ignored or overlooked.
- Zig zag colored regions
- Top colored bar
- background variations on the "yellow"
- Script typefaces
All of these can be incorporated in much the same manner in an app to retain the overall branding.
For ease and quickness, I used a script font which doesn't match the company's site. If it were my project, I'd ensure the typefaces match. In addition, the pattern in the bottom shape is representative. I'd use the same pattern found on the web site.
Maintaining branding is all about repeating elements and appearances and how they are utilized. Simply matching colors is rarely enough.
At the web site, green or a "teal blue" are used for "action items". Other than the little top left ball, orange is not an action color from the web site. So the app should adhere to this usage - utilizing the green and teal for action items. And action items (buttons) on the site are all set in uppercase type, I'd match that as well.
Sidebar... it seems you're using some sans serif font that actually does more harm than good. Not sure what typeface it is.. but overall that choice of typeface does more to convey a sense of "amateur" than anything else in my opinion. Whatever it is, it does not match the typefaces from the web site. Basically.. I really dislike your choice of sans serif typeface. It, to me, looks "cheap".