I noticed like ten years ago how many significant characters in our community are rodents, and the number has only grown since then.
The game is called OHRodents, and has many playable rodent characters. Typical player character HP is 5, HP cap is 9, mouse-sized random enemies generally have 2 HP, most attacks do either 1 damage with a secondary effect (elemental damage, spread, multi-hit) or 2 damage with a drawback (higher cost, elemental damage, inaccurate, long delay).
Even though a bunch of these rodent characters were roughly human-size in their debut games, this one is going to have them be an average of 3 inches tall.
- Bob and Misa from Wandering Hamster
The five Rodentian mice from Walthros/Walthrus (basing Grape in particular on the "he's fat and useless" Walthrus version, Blueberry wearing shades and asking people to help him beat the snake, and Rice having an allusion to her Walthrus personality being a dark path she could have taken if she didn't have better guidance; I guess I'm just leaning towards their Walthrus incarnations in general)
Jude the Rat from Heavenly Dreamers
Catnip from Catman
Mouse from Star Cops (renamed Officer Mouse for clarity)
Mouse from The Adventures of Bill (renamed Dr. Mouse for clarity)
Pikahcu from Arfenhouse
The Grand Zark from Pilgrimage
Radar from Radar Rat-Race
Me! Nathan Karr, depicted as a magical mouse fairy! I'm a jack of all trades and the starting character, but as soon as you get anyone else there will be the option to stop using me.
Enemy encounters with rodents in other OHR games will also generally be represented so long as I can remember them - and creatures significantly larger than rats and squirrels can even have two-digit HP and attacks strong enough to reliably one-shot an unarmored mouse! Don't try to beat the snake without wearing proper protection is what I'm saying here.