Google has been teasing improvements to mobile and cloud video editing for a while and it's now here, I've tested it on my Samsung Galaxy S9+ (below) and iPhone 12 Pro Max. Previously all you could do was stabilise, rotate, and trim videos, but now you have more cropping options, individual frame exports, horizon correction, and audio removal. Plus colour correction options similar to when editing photos, such as brightness, contrast, white point, warmth, tint, skin colour, and vignette.
Tap on 'Edit' to get started. This video was actually on the test phone, but Google Photos is a service as much as an application and it doesn't actually matter where the video started as long as you have a good connection, i.e. upload to the service from a Windows 10 hybrid and edit things on an Android phone.
Stabilising footage works well (though modern phones tend to shoot stable footage in the first place); (right) some of the cropping options for your video.
Adjusting lighting and colour parameters, of which there are many; (right) trying out some of the dozen or so filters, which can be applied to videos with a tap...
This update is live now in the Android and iOS app stores on-device, so go have a play.