the author's comment just says this:Note: There was a cracked version of sequencer software Cakewalk that would put a text event containing ".u..f..r" in the MIDI files it made. So ".u..f..r" is probably the person or group that cracked the software and not a useful lead about the author or source of the MIDI file.
.u..f..r (probably the artist)
The piece sounds fairly 'modern' to me. A version of a song, or from a film score? Just guesses.
Extra info - the site you link to is discordapp - this is not really a 'free MIDI site', it's a sort of messageing system (sort of like twitter etc) so the file may have been placed there by the author/performer? Your best bet would be to try to access the system and contact whoever posted the file (attached it to their posting/message/channel) and ask.
Just what did you do there, and how. I take it you have access to the original game, and the music is created using midi information within the game. You've been able to 'capture' the midi data as it's playing, and you've then got that data into a midi file. Is that so?
Is there not another file with some more info about the composer? Maybe you've got the answer to your original question, hidden somewhere in the data you've got?
As I noted above, there are others asking about this music, and there are at least a couple of 're-creations' of the music on YouTube. These versions are not in the same league as what you have here. Many YouTube videos have an open 'comments' area, you can just go in and leave a message for future viewers of the video. You could easily 'blow your own trumpet' (quite justified) and tell people that you have 'captured' a complete version of the song, and it can be downloaded from (here). I think you SHOULD do that!
Back in the older days of ROBLOX there was no way to import your own music to your game, so a guy named Gamehero made a plugin in Lua (programming language) that allows MIDI files converted into Base16/Hex to playback like they normally would if they weren't even converted. What I did here was just reverse the entire process, I got a hold of the .rbxl place file (Roblox Place Data in XML) by dumping it using an unofficial program and went to Roblox Studio and found the value that contained the Hex data to play the song, I pasted the entire Hex code into a [hex editor] program called HxD and saved the file as a MIDI file. Thus, creating the MIDI song you've been listening to!