We need a Game like the Dino run game in Chrome

We neead a Game that will be used to entertain people for about 30 seconds while they wait for their bank account to connect. It needs to fit on a mobile phone in portrait mode and be roughly square. I’d like it to be very simple as the fancier it is the less trustworthy it will feel in this context. I’m thinking of something like the Dino run game in Chrome when you are offline for look and feel. Possibly line art or 8 bit. Single color with different shades so that I can specify a new color and you can crank out assets based on it and it will match the colors of the mobile application it’s being embedded inside. This first version should be grayscale. Gameplay will be a simplified version of fishing inside links awakening. Gamer should be able to catch a fish within 20 seconds but not within 10 seconds.