For the what now part, submit it to other scratch games This is a leaderboard for scratch games that were rejected from speedrun.com
For the rejected part, the game request rules are very subjective, and just because you think it meets the criteria doesn't guarantee it will be accepted. Make sure to add as many details as you can to the additional notes field to increase your chance of getting accepted.
While the game is certainly higher quality than a lot of Scratch games, it is too short to be accepted under the normal rules. The (kinda official?) guidelines are that a casual playthrough should be longer than five minutes at the minimum; this game has three levels (it's in the title) which each take less than a minute.
I have to say, you're pretty committed to getting a bunch of games on the site; your enthusiasm is appreciated. Just don't try and mod farm...