Ok, well it's good that you asked permission. It's just modding is not something we ever hear of in regards to Visionaire Studio as it's a 2D point & click adventure game engine & there's very little in the way of what could be modded.
Upscaling or downscaling games in Visionaire Studio requires a bit of work because you would also need to redo all the object interaction polygons, interaction positions, & way systems (borders + paths + scaling points) again if you were to change the default game resolution. In other words you can't just replace the png/webp image files.
I would also like to point out that most people according to steam stats (at least 60% of steam users) are still using screens with a resolution of 1920x1080 & the amount of people using 2k, 3k, & 4k resolution screens is less than 10% in total.
& on that note, high resolution 2D games can be very heavy when it comes to system resource usage, 1080p is already bad enough for games that are animation heavy. 2K & 4K is just asking for trouble with animation heavy games & you are severely limiting the amount of people that can play your game & which platforms you can export for.
Visionaire Studio has a built in export option for exporting a game at a different resolution other than the default game resolution specified in the main project settings section of the editor, but we always recommend against using it because it's very hit & miss in regards to it correctly adjusting positions & interaction polygons, etc.
The recommended resolution if you want to target android/ios devices would be 1280x720 or lower, & 1920x1080 for full hd games if you only want to target desktop &/or consoles. Also the webp image format is recommended regardless of resolution as they are much smaller in file size than png & thus save on storage space for total game size & the smaller file sizes means faster loading times for images & animations.
In regards to STASIS it was given away for free recently on GOG.
P.S: I know I ranted on a bit & I wrote about things you didn't ask about, but I figured I should at least provide you with relevant information to take into consideration if/when you decide to work on a game yourself. & on that note my biggest tip is, don't base the default game resolution on whatever your monitor resolution is. 16:9 = most common aspect ratio. 1920x1080 = current most common monitor resolution. 480x270 is a good 16:9 aspect ratio resolution for old school low resolution pixel art games. 1920x1080 is good for full hd traditional third person & click adventure games & visual novels/myst-likes, but you can probably get away with higher resolution for myst-likes & visual novels on account of them not often having many animations & being mostly static. 1280x720 is good for handheld devices. webp over png for reduced total game storage size & faster loading times.