Thanks for the feedback... I don't know how to make it work!!! Oh god
A friend of mine was able to run the EXE smoothly and install the game.
I find it super odd that this is happening. Regardless, I'm going to release the CGs, try to fix it and move on to the next project in VX Ace which really works much more fluidly. : /
I chose RPG Maker 2000 because the limitations would force me to create something more compact, but it seems it backfired...