You can, but most users won't, and maybe even shouldn't.

The message does not need to be designed this hostile, though. The 'Install' button is completely hidden, and designed to look exactly like text when you find it.

Also the title refers to the app directly as "unsafe" which Google has no way to reasonably conclude. That feels like slander.

Unrecognized? Sure. Untrusted? Maybe. Unsafe? No.

Maybe market to grown-ups instead.