Are you interested in webgames or mobile at all? If so, I moderate some that fit your description.

Crack Down (Sega genesis, WiiVC and pc Megadrive collection). The steam version has a wallglitch that can reduce the run to under 10min. All versions have it, only only the pc version can do it without hardware modification, as it requires U+D+L at the same time.

Do not confuse it with crackdown, which is a fps. Crack Down is a topdown shootee, placing bombs.

Available on steam for under 3$.

Ones that kinda fit your description, don't have many players, and plenty of room for optimization:

https://www.speedrun.com/Midnight_Rescue | https://classicreload.com/super-solvers-midnight-rescue.html https://www.speedrun.com/Mixed_up_Fairy_Tales | https://classicreload.com/mixed-up-fairy-tales.html https://www.speedrun.com/humans | https://classicreload.com/humans.html

== I'm in the process of trying to optimize this one to death, but I don't think I've quite got it yet. ¤HOWEVER¤ it is totally full of weird / hilarious / potentially useful? glitches. I think the devs just didn't care at all, heh.

https://www.speedrun.com/hapc/guides | https://classicreload.com/home-alone.html