My Powkiddy RGB 20s doesn't work.

I played Sonic 3 on my Powkiddy RGB 20s. Then I accidentally pressed the arrow keys in the middle and the screen went black. I then turned the device off and then turned it on again. Now all that's left is this weird screen. What can I do?

I played Sonic 3 on my Powkiddy RGB 20s. Then I accidentally pressed the arrow keys in the middle and the screen went black. I then turned the device off and then turned it on again. Now all that's left is this weird screen. What can I do?