I know its not retro but it has that early internet vibe going with the art style. Its like Pachinko but its a rouge-like with RNG where you aim a ball (Nubby) at pegs and each time Nubby hits the peg, the number on it halves until the number hits 0. Its only $4.99 on steam and theres a pre-release demo you can check out too if you wanna check out the core mechanics of the game before you buy.
https://store.steampowered.com/app/3191030/Nubbys_Number_Factory/