Front Mission 1st Remake Version 1.0.3 UCS Instant/Fast Battle and Motion
A full list of updates is here, but in short triple speed and skippable battle animations (though not cutscenes and you have to apply changes with X) enhance the game greatly (this gives me faith in the front mission trilogy compared to dragon quest switch/mobile or final fantasy pixel remasters that recycled a ton of stuff over learn, and even removed peninsula of power): https://www.nintendolife.com/news/2022/12/front-mission-1st-remake-gets-a-hefty-update-here-are-the-patch-notes
You also have remastered and original soundtracks available which is nice (why not differentiate the campaigns with remastered and classic mode), as well as saving should RNG mess you up (you randomly hit wanzer body parts unless a shield tanks some of the damage, with a kill for the body, slow movement for legs, and disabled weapons for each arm).
You have both campaigns (this is UCS) from the DS version as well. Unfortunately there are 20 second load times like with langrisser, but instead of booting, it's between cutscenes. I also recommend lowering the difficulty for UCS as a boss is after the first fight who is RNG heavy with dodging and one shotting the body of wanders.
0:00 Instant Battle
0:06 Apply Triple Speed
0:13 Piz-3 Rocket Launcher
0:19 WS-II Shield
0:22 Fast Movement and Winee Rifle
0:37 Siege Machine Gun Counterattack
0:45 Nightvision Calm Punch Misses