Not only that could allow more interesting mods, but also the possibility to easily change "textures", character sprites, new enemies, etc.

for example, one thing i was searching for and which could be tweaked with a text file (if the possibility existed) is to increase the walking speed of mechs, and maybe limit how much they destroy when landing from different heights. Maybe changing how much the "time freeze effect" lasts could also be changed, and could be limited to receiving damage, but without killing the character; or maybe special enemies could appear after a few seconds when activating a "time freeze", to make it a risky option. maybe bros could have a new playing mode through mods, to allow more than one hitpoint, and the ability to always keep an additional items, plus ability to choose it or their "inner power".

The mods could work locally for playing solo or coop; or also online, if there were also alternative servers which provided collections with special themes and mods.