Number go up, monke brain go yes. Shiny rock click clack good.
The playstyle of this is simple but it's effective - you know what to do, roll higher than your opponent. I do think having way more items and tricks up your sleeve can make this really stand out for such a simple mechanic to really shine. Like stacking a ton of discount coupons on a purchase at the supermarket and suddenly they owe you money, except the supermarket is the game, the money is dice, and somehow you rolled three nat 20s in a row.
The core loop is tight, and straightforward - visually it's not too flashy, and you could definitely make it stand out with some juice to make this really shine. But simple is effective here - with refinement this could easily be the sort of game you sit and play idly while procrastinating.
I liked it. It's got potential to be the foundation for something bigger if it wanted to.