In case you didn't figure this out, you can actually slot this into RPG Maker VX Ace without a hitch, as both VXA and this set are drawn in 32x32. For MV/MZ (which are 48x48), you'll probably need a plugin to change the game's default resolution to keep things looking clean, lest you have to upscale these assets by 1.5x, which results in inconsistent pixel sizes.