I noticed there's no section for Universal Paperclip (http://www.decisionproblem.com/paperclips/index2.html) and have been considering running this game (current WR is 1hr 59min I think), is it a game that would be accepted on this site?

The site has recently decided to limit the amount of random flash/webgames they accept mainly because there are thousands of games that are seconds or minutes long are mostly just crap games people use for free WRs.

That being said, there are definitely legitimate games that aren’t the same old flash/webgame fodder. You can submit the game at

https://www.speedrun.com/requestgame

Make sure to read the rules for submissions, but if the game has actual substance behind it (which it seems to if WR is just under 2 hours) then I’d say you’re in better shape than other browser games.

Try requesting it by all means, but the site is generally trying to lean away from accepting any old web games, so can't make any promises.