If you think 5$ is too much, then don't buy it. No problem. I don't have 500$ to buy an Oculus Quest in order to test it for you.
2d games appear as a floating window.
If it works on GearVR as 3d, it probably works in 3d on Quest, then the next biggest question is does it work with the controllers... That's often an issue.
There are lots of Quest owners on itch.io looking for games now (Sidequest is gaining popularity, but some of the listings on it require visiting itch to purchase the game).