For simple apps like that I usually check out F-droid see if any open source versions exist. Might not be as feature rich but there’s two GPS speedometer apps on there
Status Bar Speedometer (Display your current speed as notification) https://f-droid.org/packages/ch.rmy.android.statusbar_tacho/
Blue Square Speedometer (Simple speedometer & GPS viewer) https://f-droid.org/packages/net.nhiroki.bluesquarespeedometer/
Haven’t had a chance to play God of War yet so that would be sweet, happy holidays and thanks for the giveaway